drivers/usb/gadget/amd5536udc.c

   1 /*
   2  * amd5536.c -- AMD 5536 UDC high/full speed USB device controller
   3  *
   4  * Copyright (C) 2005-2007 AMD (http://www.amd.com)
   5  * Author: Thomas Dahlmann
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 /*
  23  * The AMD5536 UDC is part of the x86 southbridge AMD Geode CS5536.
  24  * It is a USB Highspeed DMA capable USB device controller. Beside ep0 it
  25  * provides 4 IN and 4 OUT endpoints (bulk or interrupt type).
  26  *
  27  * Make sure that UDC is assigned to port 4 by BIOS settings (port can also
  28  * be used as host port) and UOC bits PAD_EN and APU are set (should be done
  29  * by BIOS init).
  30  *
  31  * UDC DMA requires 32-bit aligned buffers so DMA with gadget ether does not
  32  * work without updating NET_IP_ALIGN. Or PIO mode (module param "use_dma=0")
  33  * can be used with gadget ether.
  34  */
  35
  36 /* debug control */
  37 /* #define UDC_VERBOSE */
  38
  39 /* Driver strings */
  40 #define UDC_MOD_DESCRIPTION             "AMD 5536 UDC - USB Device Controller"
  41 #define UDC_DRIVER_VERSION_STRING       "01.00.0206 - $Revision: #3 $"
  42
  43 /* system */
  44 #include <linux/module.h>
  45 #include <linux/pci.h>
  46 #include <linux/kernel.h>
  47 #include <linux/delay.h>
  48 #include <linux/ioport.h>
  49 #include <linux/sched.h>
  50 #include <linux/slab.h>
  51 #include <linux/errno.h>
  52 #include <linux/init.h>
  53 #include <linux/timer.h>
  54 #include <linux/list.h>
  55 #include <linux/interrupt.h>
  56 #include <linux/ioctl.h>
  57 #include <linux/fs.h>
  58 #include <linux/dmapool.h>
  59 #include <linux/moduleparam.h>
  60 #include <linux/device.h>
  61 #include <linux/io.h>
  62 #include <linux/irq.h>
  63
  64 #include <asm/byteorder.h>
  65 #include <asm/system.h>
  66 #include <asm/unaligned.h>
  67
  68 /* gadget stack */
  69 #include <linux/usb/ch9.h>
  70 #include <linux/usb/gadget.h>
  71
  72 /* udc specific */
  73 #include "amd5536udc.h"
  74
  75
  76 static void udc_tasklet_disconnect(unsigned long);
  77 static void empty_req_queue(struct udc_ep *);
  78 static int udc_probe(struct udc *dev);
  79 static void udc_basic_init(struct udc *dev);
  80 static void udc_setup_endpoints(struct udc *dev);
  81 static void udc_soft_reset(struct udc *dev);
  82 static struct udc_request *udc_alloc_bna_dummy(struct udc_ep *ep);
  83 static void udc_free_request(struct usb_ep *usbep, struct usb_request *usbreq);
  84 static int udc_free_dma_chain(struct udc *dev, struct udc_request *req);
  85 static int udc_create_dma_chain(struct udc_ep *ep, struct udc_request *req,
  86                                 unsigned long buf_len, gfp_t gfp_flags);
  87 static int udc_remote_wakeup(struct udc *dev);
  88 static int udc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
  89 static void udc_pci_remove(struct pci_dev *pdev);
  90
  91 /* description */
  92 static const char mod_desc[] = UDC_MOD_DESCRIPTION;
  93 static const char name[] = "amd5536udc";
  94
  95 /* structure to hold endpoint function pointers */
  96 static const struct usb_ep_ops udc_ep_ops;
  97
  98 /* received setup data */
  99 static union udc_setup_data setup_data;
 100
 101 /* pointer to device object */
 102 static struct udc *udc;
 103
 104 /* irq spin lock for soft reset */
 105 static DEFINE_SPINLOCK(udc_irq_spinlock);
 106 /* stall spin lock */
 107 static DEFINE_SPINLOCK(udc_stall_spinlock);
 108
 109 /*
 110 * slave mode: pending bytes in rx fifo after nyet,
 111 * used if EPIN irq came but no req was available
 112 */
 113 static unsigned int udc_rxfifo_pending;
 114
 115 /* count soft resets after suspend to avoid loop */
 116 static int soft_reset_occured;
 117 static int soft_reset_after_usbreset_occured;
 118
 119 /* timer */
 120 static struct timer_list udc_timer;
 121 static int stop_timer;
 122
 123 /* set_rde -- Is used to control enabling of RX DMA. Problem is
 124  * that UDC has only one bit (RDE) to enable/disable RX DMA for
 125  * all OUT endpoints. So we have to handle race conditions like
 126  * when OUT data reaches the fifo but no request was queued yet.
 127  * This cannot be solved by letting the RX DMA disabled until a
 128  * request gets queued because there may be other OUT packets
 129  * in the FIFO (important for not blocking control traffic).
 130  * The value of set_rde controls the correspondig timer.
 131  *
 132  * set_rde -1 == not used, means it is alloed to be set to 0 or 1
 133  * set_rde  0 == do not touch RDE, do no start the RDE timer
 134  * set_rde  1 == timer function will look whether FIFO has data
 135  * set_rde  2 == set by timer function to enable RX DMA on next call
 136  */
 137 static int set_rde = -1;
 138
 139 static DECLARE_COMPLETION(on_exit);
 140 static struct timer_list udc_pollstall_timer;
 141 static int stop_pollstall_timer;
 142 static DECLARE_COMPLETION(on_pollstall_exit);
 143
 144 /* tasklet for usb disconnect */
 145 static DECLARE_TASKLET(disconnect_tasklet, udc_tasklet_disconnect,
 146                 (unsigned long) &udc);
 147
 148
 149 /* endpoint names used for print */
 150 static const char ep0_string[] = "ep0in";
 151 static const char *ep_string[] = {
 152         ep0_string,
 153         "ep1in-int", "ep2in-bulk", "ep3in-bulk", "ep4in-bulk", "ep5in-bulk",
 154         "ep6in-bulk", "ep7in-bulk", "ep8in-bulk", "ep9in-bulk", "ep10in-bulk",
 155         "ep11in-bulk", "ep12in-bulk", "ep13in-bulk", "ep14in-bulk",
 156         "ep15in-bulk", "ep0out", "ep1out-bulk", "ep2out-bulk", "ep3out-bulk",
 157         "ep4out-bulk", "ep5out-bulk", "ep6out-bulk", "ep7out-bulk",
 158         "ep8out-bulk", "ep9out-bulk", "ep10out-bulk", "ep11out-bulk",
 159         "ep12out-bulk", "ep13out-bulk", "ep14out-bulk", "ep15out-bulk"
 160 };
 161
 162 /* DMA usage flag */
 163 static int use_dma = 1;
 164 /* packet per buffer dma */
 165 static int use_dma_ppb = 1;
 166 /* with per descr. update */
 167 static int use_dma_ppb_du;
 168 /* buffer fill mode */
 169 static int use_dma_bufferfill_mode;
 170 /* full speed only mode */
 171 static int use_fullspeed;
 172 /* tx buffer size for high speed */
 173 static unsigned long hs_tx_buf = UDC_EPIN_BUFF_SIZE;
 174
 175 /* module parameters */
 176 module_param(use_dma, bool, S_IRUGO);
 177 MODULE_PARM_DESC(use_dma, "true for DMA");
 178 module_param(use_dma_ppb, bool, S_IRUGO);
 179 MODULE_PARM_DESC(use_dma_ppb, "true for DMA in packet per buffer mode");
 180 module_param(use_dma_ppb_du, bool, S_IRUGO);
 181 MODULE_PARM_DESC(use_dma_ppb_du,
 182         "true for DMA in packet per buffer mode with descriptor update");
 183 module_param(use_fullspeed, bool, S_IRUGO);
 184 MODULE_PARM_DESC(use_fullspeed, "true for fullspeed only");
 185
 186 /*---------------------------------------------------------------------------*/
 187 /* Prints UDC device registers and endpoint irq registers */
 188 static void print_regs(struct udc *dev)
 189 {
 190         DBG(dev, "------- Device registers -------\n");
 191         DBG(dev, "dev config     = %08x\n", readl(&dev->regs->cfg));
 192         DBG(dev, "dev control    = %08x\n", readl(&dev->regs->ctl));
 193         DBG(dev, "dev status     = %08x\n", readl(&dev->regs->sts));
 194         DBG(dev, "\n");
 195         DBG(dev, "dev int's      = %08x\n", readl(&dev->regs->irqsts));
 196         DBG(dev, "dev intmask    = %08x\n", readl(&dev->regs->irqmsk));
 197         DBG(dev, "\n");
 198         DBG(dev, "dev ep int's   = %08x\n", readl(&dev->regs->ep_irqsts));
 199         DBG(dev, "dev ep intmask = %08x\n", readl(&dev->regs->ep_irqmsk));
 200         DBG(dev, "\n");
 201         DBG(dev, "USE DMA        = %d\n", use_dma);
 202         if (use_dma && use_dma_ppb && !use_dma_ppb_du) {
 203                 DBG(dev, "DMA mode       = PPBNDU (packet per buffer "
 204                         "WITHOUT desc. update)\n");
 205                 dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBNDU");
 206         } else if (use_dma && use_dma_ppb_du && use_dma_ppb_du) {
 207                 DBG(dev, "DMA mode       = PPBDU (packet per buffer "
 208                         "WITH desc. update)\n");
 209                 dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBDU");
 210         }
 211         if (use_dma && use_dma_bufferfill_mode) {
 212                 DBG(dev, "DMA mode       = BF (buffer fill mode)\n");
 213                 dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "BF");
 214         }
 215         if (!use_dma) {
 216                 dev_info(&dev->pdev->dev, "FIFO mode\n");
 217         }
 218         DBG(dev, "-------------------------------------------------------\n");
 219 }
 220
 221 /* Masks unused interrupts */
 222 static int udc_mask_unused_interrupts(struct udc *dev)
 223 {
 224         u32 tmp;
 225
 226         /* mask all dev interrupts */
 227         tmp =   AMD_BIT(UDC_DEVINT_SVC) |
 228                 AMD_BIT(UDC_DEVINT_ENUM) |
 229                 AMD_BIT(UDC_DEVINT_US) |
 230                 AMD_BIT(UDC_DEVINT_UR) |
 231                 AMD_BIT(UDC_DEVINT_ES) |
 232                 AMD_BIT(UDC_DEVINT_SI) |
 233                 AMD_BIT(UDC_DEVINT_SOF)|
 234                 AMD_BIT(UDC_DEVINT_SC);
 235         writel(tmp, &dev->regs->irqmsk);
 236
 237         /* mask all ep interrupts */
 238         writel(UDC_EPINT_MSK_DISABLE_ALL, &dev->regs->ep_irqmsk);
 239
 240         return 0;
 241 }
 242
 243 /* Enables endpoint 0 interrupts */
 244 static int udc_enable_ep0_interrupts(struct udc *dev)
 245 {
 246         u32 tmp;
 247
 248         DBG(dev, "udc_enable_ep0_interrupts()\n");
 249
 250         /* read irq mask */
 251         tmp = readl(&dev->regs->ep_irqmsk);
 252         /* enable ep0 irq's */
 253         tmp &= AMD_UNMASK_BIT(UDC_EPINT_IN_EP0)
 254                 & AMD_UNMASK_BIT(UDC_EPINT_OUT_EP0);
 255         writel(tmp, &dev->regs->ep_irqmsk);
 256
 257         return 0;
 258 }
 259
 260 /* Enables device interrupts for SET_INTF and SET_CONFIG */
 261 static int udc_enable_dev_setup_interrupts(struct udc *dev)
 262 {
 263         u32 tmp;
 264
 265         DBG(dev, "enable device interrupts for setup data\n");
 266
 267         /* read irq mask */
 268         tmp = readl(&dev->regs->irqmsk);
 269
 270         /* enable SET_INTERFACE, SET_CONFIG and other needed irq's */
 271         tmp &= AMD_UNMASK_BIT(UDC_DEVINT_SI)
 272                 & AMD_UNMASK_BIT(UDC_DEVINT_SC)
 273                 & AMD_UNMASK_BIT(UDC_DEVINT_UR)
 274                 & AMD_UNMASK_BIT(UDC_DEVINT_SVC)
 275                 & AMD_UNMASK_BIT(UDC_DEVINT_ENUM);
 276         writel(tmp, &dev->regs->irqmsk);
 277
 278         return 0;
 279 }
 280
 281 /* Calculates fifo start of endpoint based on preceeding endpoints */
 282 static int udc_set_txfifo_addr(struct udc_ep *ep)
 283 {
 284         struct udc      *dev;
 285         u32 tmp;
 286         int i;
 287
 288         if (!ep || !(ep->in))
 289                 return -EINVAL;
 290
 291         dev = ep->dev;
 292         ep->txfifo = dev->txfifo;
 293
 294         /* traverse ep's */
 295         for (i = 0; i < ep->num; i++) {
 296                 if (dev->ep[i].regs) {
 297                         /* read fifo size */
 298                         tmp = readl(&dev->ep[i].regs->bufin_framenum);
 299                         tmp = AMD_GETBITS(tmp, UDC_EPIN_BUFF_SIZE);
 300                         ep->txfifo += tmp;
 301                 }
 302         }
 303         return 0;
 304 }
 305
 306 /* CNAK pending field: bit0 = ep0in, bit16 = ep0out */
 307 static u32 cnak_pending;
 308
 309 static void UDC_QUEUE_CNAK(struct udc_ep *ep, unsigned num)
 310 {
 311         if (readl(&ep->regs->ctl) & AMD_BIT(UDC_EPCTL_NAK)) {
 312                 DBG(ep->dev, "NAK could not be cleared for ep%d\n", num);
 313                 cnak_pending |= 1 << (num);
 314                 ep->naking = 1;
 315         } else
 316                 cnak_pending = cnak_pending & (~(1 << (num)));
 317 }
 318
 319
 320 /* Enables endpoint, is called by gadget driver */
 321 static int
 322 udc_ep_enable(struct usb_ep *usbep, const struct usb_endpoint_descriptor *desc)
 323 {
 324         struct udc_ep           *ep;
 325         struct udc              *dev;
 326         u32                     tmp;
 327         unsigned long           iflags;
 328         u8 udc_csr_epix;
 329         unsigned                maxpacket;
 330
 331         if (!usbep
 332                         || usbep->name == ep0_string
 333                         || !desc
 334                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 335                 return -EINVAL;
 336
 337         ep = container_of(usbep, struct udc_ep, ep);
 338         dev = ep->dev;
 339
 340         DBG(dev, "udc_ep_enable() ep %d\n", ep->num);
 341
 342         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
 343                 return -ESHUTDOWN;
 344
 345         spin_lock_irqsave(&dev->lock, iflags);
 346         ep->desc = desc;
 347
 348         ep->halted = 0;
 349
 350         /* set traffic type */
 351         tmp = readl(&dev->ep[ep->num].regs->ctl);
 352         tmp = AMD_ADDBITS(tmp, desc->bmAttributes, UDC_EPCTL_ET);
 353         writel(tmp, &dev->ep[ep->num].regs->ctl);
 354
 355         /* set max packet size */
 356         maxpacket = le16_to_cpu(desc->wMaxPacketSize);
 357         tmp = readl(&dev->ep[ep->num].regs->bufout_maxpkt);
 358         tmp = AMD_ADDBITS(tmp, maxpacket, UDC_EP_MAX_PKT_SIZE);
 359         ep->ep.maxpacket = maxpacket;
 360         writel(tmp, &dev->ep[ep->num].regs->bufout_maxpkt);
 361
 362         /* IN ep */
 363         if (ep->in) {
 364
 365                 /* ep ix in UDC CSR register space */
 366                 udc_csr_epix = ep->num;
 367
 368                 /* set buffer size (tx fifo entries) */
 369                 tmp = readl(&dev->ep[ep->num].regs->bufin_framenum);
 370                 /* double buffering: fifo size = 2 x max packet size */
 371                 tmp = AMD_ADDBITS(
 372                                 tmp,
 373                                 maxpacket * UDC_EPIN_BUFF_SIZE_MULT
 374                                           / UDC_DWORD_BYTES,
 375                                 UDC_EPIN_BUFF_SIZE);
 376                 writel(tmp, &dev->ep[ep->num].regs->bufin_framenum);
 377
 378                 /* calc. tx fifo base addr */
 379                 udc_set_txfifo_addr(ep);
 380
 381                 /* flush fifo */
 382                 tmp = readl(&ep->regs->ctl);
 383                 tmp |= AMD_BIT(UDC_EPCTL_F);
 384                 writel(tmp, &ep->regs->ctl);
 385
 386         /* OUT ep */
 387         } else {
 388                 /* ep ix in UDC CSR register space */
 389                 udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
 390
 391                 /* set max packet size UDC CSR  */
 392                 tmp = readl(&dev->csr->ne[ep->num - UDC_CSR_EP_OUT_IX_OFS]);
 393                 tmp = AMD_ADDBITS(tmp, maxpacket,
 394                                         UDC_CSR_NE_MAX_PKT);
 395                 writel(tmp, &dev->csr->ne[ep->num - UDC_CSR_EP_OUT_IX_OFS]);
 396
 397                 if (use_dma && !ep->in) {
 398                         /* alloc and init BNA dummy request */
 399                         ep->bna_dummy_req = udc_alloc_bna_dummy(ep);
 400                         ep->bna_occurred = 0;
 401                 }
 402
 403                 if (ep->num != UDC_EP0OUT_IX)
 404                         dev->data_ep_enabled = 1;
 405         }
 406
 407         /* set ep values */
 408         tmp = readl(&dev->csr->ne[udc_csr_epix]);
 409         /* max packet */
 410         tmp = AMD_ADDBITS(tmp, maxpacket, UDC_CSR_NE_MAX_PKT);
 411         /* ep number */
 412         tmp = AMD_ADDBITS(tmp, desc->bEndpointAddress, UDC_CSR_NE_NUM);
 413         /* ep direction */
 414         tmp = AMD_ADDBITS(tmp, ep->in, UDC_CSR_NE_DIR);
 415         /* ep type */
 416         tmp = AMD_ADDBITS(tmp, desc->bmAttributes, UDC_CSR_NE_TYPE);
 417         /* ep config */
 418         tmp = AMD_ADDBITS(tmp, ep->dev->cur_config, UDC_CSR_NE_CFG);
 419         /* ep interface */
 420         tmp = AMD_ADDBITS(tmp, ep->dev->cur_intf, UDC_CSR_NE_INTF);
 421         /* ep alt */
 422         tmp = AMD_ADDBITS(tmp, ep->dev->cur_alt, UDC_CSR_NE_ALT);
 423         /* write reg */
 424         writel(tmp, &dev->csr->ne[udc_csr_epix]);
 425
 426         /* enable ep irq */
 427         tmp = readl(&dev->regs->ep_irqmsk);
 428         tmp &= AMD_UNMASK_BIT(ep->num);
 429         writel(tmp, &dev->regs->ep_irqmsk);
 430
 431         /*
 432          * clear NAK by writing CNAK
 433          * avoid BNA for OUT DMA, don't clear NAK until DMA desc. written
 434          */
 435         if (!use_dma || ep->in) {
 436                 tmp = readl(&ep->regs->ctl);
 437                 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
 438                 writel(tmp, &ep->regs->ctl);
 439                 ep->naking = 0;
 440                 UDC_QUEUE_CNAK(ep, ep->num);
 441         }
 442         tmp = desc->bEndpointAddress;
 443         DBG(dev, "%s enabled\n", usbep->name);
 444
 445         spin_unlock_irqrestore(&dev->lock, iflags);
 446         return 0;
 447 }
 448
 449 /* Resets endpoint */
 450 static void ep_init(struct udc_regs __iomem *regs, struct udc_ep *ep)
 451 {
 452         u32             tmp;
 453
 454         VDBG(ep->dev, "ep-%d reset\n", ep->num);
 455         ep->desc = NULL;
 456         ep->ep.ops = &udc_ep_ops;
 457         INIT_LIST_HEAD(&ep->queue);
 458
 459         ep->ep.maxpacket = (u16) ~0;
 460         /* set NAK */
 461         tmp = readl(&ep->regs->ctl);
 462         tmp |= AMD_BIT(UDC_EPCTL_SNAK);
 463         writel(tmp, &ep->regs->ctl);
 464         ep->naking = 1;
 465
 466         /* disable interrupt */
 467         tmp = readl(&regs->ep_irqmsk);
 468         tmp |= AMD_BIT(ep->num);
 469         writel(tmp, &regs->ep_irqmsk);
 470
 471         if (ep->in) {
 472                 /* unset P and IN bit of potential former DMA */
 473                 tmp = readl(&ep->regs->ctl);
 474                 tmp &= AMD_UNMASK_BIT(UDC_EPCTL_P);
 475                 writel(tmp, &ep->regs->ctl);
 476
 477                 tmp = readl(&ep->regs->sts);
 478                 tmp |= AMD_BIT(UDC_EPSTS_IN);
 479                 writel(tmp, &ep->regs->sts);
 480
 481                 /* flush the fifo */
 482                 tmp = readl(&ep->regs->ctl);
 483                 tmp |= AMD_BIT(UDC_EPCTL_F);
 484                 writel(tmp, &ep->regs->ctl);
 485
 486         }
 487         /* reset desc pointer */
 488         writel(0, &ep->regs->desptr);
 489 }
 490
 491 /* Disables endpoint, is called by gadget driver */
 492 static int udc_ep_disable(struct usb_ep *usbep)
 493 {
 494         struct udc_ep   *ep = NULL;
 495         unsigned long   iflags;
 496
 497         if (!usbep)
 498                 return -EINVAL;
 499
 500         ep = container_of(usbep, struct udc_ep, ep);
 501         if (usbep->name == ep0_string || !ep->desc)
 502                 return -EINVAL;
 503
 504         DBG(ep->dev, "Disable ep-%d\n", ep->num);
 505
 506         spin_lock_irqsave(&ep->dev->lock, iflags);
 507         udc_free_request(&ep->ep, &ep->bna_dummy_req->req);
 508         empty_req_queue(ep);
 509         ep_init(ep->dev->regs, ep);
 510         spin_unlock_irqrestore(&ep->dev->lock, iflags);
 511
 512         return 0;
 513 }
 514
 515 /* Allocates request packet, called by gadget driver */
 516 static struct usb_request *
 517 udc_alloc_request(struct usb_ep *usbep, gfp_t gfp)
 518 {
 519         struct udc_request      *req;
 520         struct udc_data_dma     *dma_desc;
 521         struct udc_ep   *ep;
 522
 523         if (!usbep)
 524                 return NULL;
 525
 526         ep = container_of(usbep, struct udc_ep, ep);
 527
 528         VDBG(ep->dev, "udc_alloc_req(): ep%d\n", ep->num);
 529         req = kzalloc(sizeof(struct udc_request), gfp);
 530         if (!req)
 531                 return NULL;
 532
 533         req->req.dma = DMA_DONT_USE;
 534         INIT_LIST_HEAD(&req->queue);
 535
 536         if (ep->dma) {
 537                 /* ep0 in requests are allocated from data pool here */
 538                 dma_desc = pci_pool_alloc(ep->dev->data_requests, gfp,
 539                                                 &req->td_phys);
 540                 if (!dma_desc) {
 541                         kfree(req);
 542                         return NULL;
 543                 }
 544
 545                 VDBG(ep->dev, "udc_alloc_req: req = %p dma_desc = %p, "
 546                                 "td_phys = %lx\n",
 547                                 req, dma_desc,
 548                                 (unsigned long)req->td_phys);
 549                 /* prevent from using desc. - set HOST BUSY */
 550                 dma_desc->status = AMD_ADDBITS(dma_desc->status,
 551                                                 UDC_DMA_STP_STS_BS_HOST_BUSY,
 552                                                 UDC_DMA_STP_STS_BS);
 553                 dma_desc->bufptr = cpu_to_le32(DMA_DONT_USE);
 554                 req->td_data = dma_desc;
 555                 req->td_data_last = NULL;
 556                 req->chain_len = 1;
 557         }
 558
 559         return &req->req;
 560 }
 561
 562 /* Frees request packet, called by gadget driver */
 563 static void
 564 udc_free_request(struct usb_ep *usbep, struct usb_request *usbreq)
 565 {
 566         struct udc_ep   *ep;
 567         struct udc_request      *req;
 568
 569         if (!usbep || !usbreq)
 570                 return;
 571
 572         ep = container_of(usbep, struct udc_ep, ep);
 573         req = container_of(usbreq, struct udc_request, req);
 574         VDBG(ep->dev, "free_req req=%p\n", req);
 575         BUG_ON(!list_empty(&req->queue));
 576         if (req->td_data) {
 577                 VDBG(ep->dev, "req->td_data=%p\n", req->td_data);
 578
 579                 /* free dma chain if created */
 580                 if (req->chain_len > 1) {
 581                         udc_free_dma_chain(ep->dev, req);
 582                 }
 583
 584                 pci_pool_free(ep->dev->data_requests, req->td_data,
 585                                                         req->td_phys);
 586         }
 587         kfree(req);
 588 }
 589
 590 /* Init BNA dummy descriptor for HOST BUSY and pointing to itself */
 591 static void udc_init_bna_dummy(struct udc_request *req)
 592 {
 593         if (req) {
 594                 /* set last bit */
 595                 req->td_data->status |= AMD_BIT(UDC_DMA_IN_STS_L);
 596                 /* set next pointer to itself */
 597                 req->td_data->next = req->td_phys;
 598                 /* set HOST BUSY */
 599                 req->td_data->status
 600                         = AMD_ADDBITS(req->td_data->status,
 601                                         UDC_DMA_STP_STS_BS_DMA_DONE,
 602                                         UDC_DMA_STP_STS_BS);
 603 #ifdef UDC_VERBOSE
 604                 pr_debug("bna desc = %p, sts = %08x\n",
 605                         req->td_data, req->td_data->status);
 606 #endif
 607         }
 608 }
 609
 610 /* Allocate BNA dummy descriptor */
 611 static struct udc_request *udc_alloc_bna_dummy(struct udc_ep *ep)
 612 {
 613         struct udc_request *req = NULL;
 614         struct usb_request *_req = NULL;
 615
 616         /* alloc the dummy request */
 617         _req = udc_alloc_request(&ep->ep, GFP_ATOMIC);
 618         if (_req) {
 619                 req = container_of(_req, struct udc_request, req);
 620                 ep->bna_dummy_req = req;
 621                 udc_init_bna_dummy(req);
 622         }
 623         return req;
 624 }
 625
 626 /* Write data to TX fifo for IN packets */
 627 static void
 628 udc_txfifo_write(struct udc_ep *ep, struct usb_request *req)
 629 {
 630         u8                      *req_buf;
 631         u32                     *buf;
 632         int                     i, j;
 633         unsigned                bytes = 0;
 634         unsigned                remaining = 0;
 635
 636         if (!req || !ep)
 637                 return;
 638
 639         req_buf = req->buf + req->actual;
 640         prefetch(req_buf);
 641         remaining = req->length - req->actual;
 642
 643         buf = (u32 *) req_buf;
 644
 645         bytes = ep->ep.maxpacket;
 646         if (bytes > remaining)
 647                 bytes = remaining;
 648
 649         /* dwords first */
 650         for (i = 0; i < bytes / UDC_DWORD_BYTES; i++) {
 651                 writel(*(buf + i), ep->txfifo);
 652         }
 653
 654         /* remaining bytes must be written by byte access */
 655         for (j = 0; j < bytes % UDC_DWORD_BYTES; j++) {
 656                 writeb((u8)(*(buf + i) >> (j << UDC_BITS_PER_BYTE_SHIFT)),
 657                                                         ep->txfifo);
 658         }
 659
 660         /* dummy write confirm */
 661         writel(0, &ep->regs->confirm);
 662 }
 663
 664 /* Read dwords from RX fifo for OUT transfers */
 665 static int udc_rxfifo_read_dwords(struct udc *dev, u32 *buf, int dwords)
 666 {
 667         int i;
 668
 669         VDBG(dev, "udc_read_dwords(): %d dwords\n", dwords);
 670
 671         for (i = 0; i < dwords; i++) {
 672                 *(buf + i) = readl(dev->rxfifo);
 673         }
 674         return 0;
 675 }
 676
 677 /* Read bytes from RX fifo for OUT transfers */
 678 static int udc_rxfifo_read_bytes(struct udc *dev, u8 *buf, int bytes)
 679 {
 680         int i, j;
 681         u32 tmp;
 682
 683         VDBG(dev, "udc_read_bytes(): %d bytes\n", bytes);
 684
 685         /* dwords first */
 686         for (i = 0; i < bytes / UDC_DWORD_BYTES; i++) {
 687                 *((u32 *)(buf + (i<<2))) = readl(dev->rxfifo);
 688         }
 689
 690         /* remaining bytes must be read by byte access */
 691         if (bytes % UDC_DWORD_BYTES) {
 692                 tmp = readl(dev->rxfifo);
 693                 for (j = 0; j < bytes % UDC_DWORD_BYTES; j++) {
 694                         *(buf + (i<<2) + j) = (u8)(tmp & UDC_BYTE_MASK);
 695                         tmp = tmp >> UDC_BITS_PER_BYTE;
 696                 }
 697         }
 698
 699         return 0;
 700 }
 701
 702 /* Read data from RX fifo for OUT transfers */
 703 static int
 704 udc_rxfifo_read(struct udc_ep *ep, struct udc_request *req)
 705 {
 706         u8 *buf;
 707         unsigned buf_space;
 708         unsigned bytes = 0;
 709         unsigned finished = 0;
 710
 711         /* received number bytes */
 712         bytes = readl(&ep->regs->sts);
 713         bytes = AMD_GETBITS(bytes, UDC_EPSTS_RX_PKT_SIZE);
 714
 715         buf_space = req->req.length - req->req.actual;
 716         buf = req->req.buf + req->req.actual;
 717         if (bytes > buf_space) {
 718                 if ((buf_space % ep->ep.maxpacket) != 0) {
 719                         DBG(ep->dev,
 720                                 "%s: rx %d bytes, rx-buf space = %d bytesn\n",
 721                                 ep->ep.name, bytes, buf_space);
 722                         req->req.status = -EOVERFLOW;
 723                 }
 724                 bytes = buf_space;
 725         }
 726         req->req.actual += bytes;
 727
 728         /* last packet ? */
 729         if (((bytes % ep->ep.maxpacket) != 0) || (!bytes)
 730                 || ((req->req.actual == req->req.length) && !req->req.zero))
 731                 finished = 1;
 732
 733         /* read rx fifo bytes */
 734         VDBG(ep->dev, "ep %s: rxfifo read %d bytes\n", ep->ep.name, bytes);
 735         udc_rxfifo_read_bytes(ep->dev, buf, bytes);
 736
 737         return finished;
 738 }
 739
 740 /* create/re-init a DMA descriptor or a DMA descriptor chain */
 741 static int prep_dma(struct udc_ep *ep, struct udc_request *req, gfp_t gfp)
 742 {
 743         int     retval = 0;
 744         u32     tmp;
 745
 746         VDBG(ep->dev, "prep_dma\n");
 747         VDBG(ep->dev, "prep_dma ep%d req->td_data=%p\n",
 748                         ep->num, req->td_data);
 749
 750         /* set buffer pointer */
 751         req->td_data->bufptr = req->req.dma;
 752
 753         /* set last bit */
 754         req->td_data->status |= AMD_BIT(UDC_DMA_IN_STS_L);
 755
 756         /* build/re-init dma chain if maxpkt scatter mode, not for EP0 */
 757         if (use_dma_ppb) {
 758
 759                 retval = udc_create_dma_chain(ep, req, ep->ep.maxpacket, gfp);
 760                 if (retval != 0) {
 761                         if (retval == -ENOMEM)
 762                                 DBG(ep->dev, "Out of DMA memory\n");
 763                         return retval;
 764                 }
 765                 if (ep->in) {
 766                         if (req->req.length == ep->ep.maxpacket) {
 767                                 /* write tx bytes */
 768                                 req->td_data->status =
 769                                         AMD_ADDBITS(req->td_data->status,
 770                                                 ep->ep.maxpacket,
 771                                                 UDC_DMA_IN_STS_TXBYTES);
 772
 773                         }
 774                 }
 775
 776         }
 777
 778         if (ep->in) {
 779                 VDBG(ep->dev, "IN: use_dma_ppb=%d req->req.len=%d "
 780                                 "maxpacket=%d ep%d\n",
 781                                 use_dma_ppb, req->req.length,
 782                                 ep->ep.maxpacket, ep->num);
 783                 /*
 784                  * if bytes < max packet then tx bytes must
 785                  * be written in packet per buffer mode
 786                  */
 787                 if (!use_dma_ppb || req->req.length < ep->ep.maxpacket
 788                                 || ep->num == UDC_EP0OUT_IX
 789                                 || ep->num == UDC_EP0IN_IX) {
 790                         /* write tx bytes */
 791                         req->td_data->status =
 792                                 AMD_ADDBITS(req->td_data->status,
 793                                                 req->req.length,
 794                                                 UDC_DMA_IN_STS_TXBYTES);
 795                         /* reset frame num */
 796                         req->td_data->status =
 797                                 AMD_ADDBITS(req->td_data->status,
 798                                                 0,
 799                                                 UDC_DMA_IN_STS_FRAMENUM);
 800                 }
 801                 /* set HOST BUSY */
 802                 req->td_data->status =
 803                         AMD_ADDBITS(req->td_data->status,
 804                                 UDC_DMA_STP_STS_BS_HOST_BUSY,
 805                                 UDC_DMA_STP_STS_BS);
 806         } else {
 807                 VDBG(ep->dev, "OUT set host ready\n");
 808                 /* set HOST READY */
 809                 req->td_data->status =
 810                         AMD_ADDBITS(req->td_data->status,
 811                                 UDC_DMA_STP_STS_BS_HOST_READY,
 812                                 UDC_DMA_STP_STS_BS);
 813
 814
 815                         /* clear NAK by writing CNAK */
 816                         if (ep->naking) {
 817                                 tmp = readl(&ep->regs->ctl);
 818                                 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
 819                                 writel(tmp, &ep->regs->ctl);
 820                                 ep->naking = 0;
 821                                 UDC_QUEUE_CNAK(ep, ep->num);
 822                         }
 823
 824         }
 825
 826         return retval;
 827 }
 828
 829 /* Completes request packet ... caller MUST hold lock */
 830 static void
 831 complete_req(struct udc_ep *ep, struct udc_request *req, int sts)
 832 __releases(ep->dev->lock)
 833 __acquires(ep->dev->lock)
 834 {
 835         struct udc              *dev;
 836         unsigned                halted;
 837
 838         VDBG(ep->dev, "complete_req(): ep%d\n", ep->num);
 839
 840         dev = ep->dev;
 841         /* unmap DMA */
 842         if (req->dma_mapping) {
 843                 if (ep->in)
 844                         pci_unmap_single(dev->pdev,
 845                                         req->req.dma,
 846                                         req->req.length,
 847                                         PCI_DMA_TODEVICE);
 848                 else
 849                         pci_unmap_single(dev->pdev,
 850                                         req->req.dma,
 851                                         req->req.length,
 852                                         PCI_DMA_FROMDEVICE);
 853                 req->dma_mapping = 0;
 854                 req->req.dma = DMA_DONT_USE;
 855         }
 856
 857         halted = ep->halted;
 858         ep->halted = 1;
 859
 860         /* set new status if pending */
 861         if (req->req.status == -EINPROGRESS)
 862                 req->req.status = sts;
 863
 864         /* remove from ep queue */
 865         list_del_init(&req->queue);
 866
 867         VDBG(ep->dev, "req %p => complete %d bytes at %s with sts %d\n",
 868                 &req->req, req->req.length, ep->ep.name, sts);
 869
 870         spin_unlock(&dev->lock);
 871         req->req.complete(&ep->ep, &req->req);
 872         spin_lock(&dev->lock);
 873         ep->halted = halted;
 874 }
 875
 876 /* frees pci pool descriptors of a DMA chain */
 877 static int udc_free_dma_chain(struct udc *dev, struct udc_request *req)
 878 {
 879
 880         int ret_val = 0;
 881         struct udc_data_dma     *td;
 882         struct udc_data_dma     *td_last = NULL;
 883         unsigned int i;
 884
 885         DBG(dev, "free chain req = %p\n", req);
 886
 887         /* do not free first desc., will be done by free for request */
 888         td_last = req->td_data;
 889         td = phys_to_virt(td_last->next);
 890
 891         for (i = 1; i < req->chain_len; i++) {
 892
 893                 pci_pool_free(dev->data_requests, td,
 894                                 (dma_addr_t) td_last->next);
 895                 td_last = td;
 896                 td = phys_to_virt(td_last->next);
 897         }
 898
 899         return ret_val;
 900 }
 901
 902 /* Iterates to the end of a DMA chain and returns last descriptor */
 903 static struct udc_data_dma *udc_get_last_dma_desc(struct udc_request *req)
 904 {
 905         struct udc_data_dma     *td;
 906
 907         td = req->td_data;
 908         while (td && !(td->status & AMD_BIT(UDC_DMA_IN_STS_L))) {
 909                 td = phys_to_virt(td->next);
 910         }
 911
 912         return td;
 913
 914 }
 915
 916 /* Iterates to the end of a DMA chain and counts bytes received */
 917 static u32 udc_get_ppbdu_rxbytes(struct udc_request *req)
 918 {
 919         struct udc_data_dma     *td;
 920         u32 count;
 921
 922         td = req->td_data;
 923         /* received number bytes */
 924         count = AMD_GETBITS(td->status, UDC_DMA_OUT_STS_RXBYTES);
 925
 926         while (td && !(td->status & AMD_BIT(UDC_DMA_IN_STS_L))) {
 927                 td = phys_to_virt(td->next);
 928                 /* received number bytes */
 929                 if (td) {
 930                         count += AMD_GETBITS(td->status,
 931                                 UDC_DMA_OUT_STS_RXBYTES);
 932                 }
 933         }
 934
 935         return count;
 936
 937 }
 938
 939 /* Creates or re-inits a DMA chain */
 940 static int udc_create_dma_chain(
 941         struct udc_ep *ep,
 942         struct udc_request *req,
 943         unsigned long buf_len, gfp_t gfp_flags
 944 )
 945 {
 946         unsigned long bytes = req->req.length;
 947         unsigned int i;
 948         dma_addr_t dma_addr;
 949         struct udc_data_dma     *td = NULL;
 950         struct udc_data_dma     *last = NULL;
 951         unsigned long txbytes;
 952         unsigned create_new_chain = 0;
 953         unsigned len;
 954
 955         VDBG(ep->dev, "udc_create_dma_chain: bytes=%ld buf_len=%ld\n",
 956                         bytes, buf_len);
 957         dma_addr = DMA_DONT_USE;
 958
 959         /* unset L bit in first desc for OUT */
 960         if (!ep->in) {
 961                 req->td_data->status &= AMD_CLEAR_BIT(UDC_DMA_IN_STS_L);
 962         }
 963
 964         /* alloc only new desc's if not already available */
 965         len = req->req.length / ep->ep.maxpacket;
 966         if (req->req.length % ep->ep.maxpacket) {
 967                 len++;
 968         }
 969
 970         if (len > req->chain_len) {
 971                 /* shorter chain already allocated before */
 972                 if (req->chain_len > 1) {
 973                         udc_free_dma_chain(ep->dev, req);
 974                 }
 975                 req->chain_len = len;
 976                 create_new_chain = 1;
 977         }
 978
 979         td = req->td_data;
 980         /* gen. required number of descriptors and buffers */
 981         for (i = buf_len; i < bytes; i += buf_len) {
 982                 /* create or determine next desc. */
 983                 if (create_new_chain) {
 984
 985                         td = pci_pool_alloc(ep->dev->data_requests,
 986                                         gfp_flags, &dma_addr);
 987                         if (!td)
 988                                 return -ENOMEM;
 989
 990                         td->status = 0;
 991                 } else if (i == buf_len) {
 992                         /* first td */
 993                         td = (struct udc_data_dma *) phys_to_virt(
 994                                                 req->td_data->next);
 995                         td->status = 0;
 996                 } else {
 997                         td = (struct udc_data_dma *) phys_to_virt(last->next);
 998                         td->status = 0;
 999                 }
1000
1001
1002                 if (td)
1003                         td->bufptr = req->req.dma + i; /* assign buffer */
1004                 else
1005                         break;
1006
1007                 /* short packet ? */
1008                 if ((bytes - i) >= buf_len) {
1009                         txbytes = buf_len;
1010                 } else {
1011                         /* short packet */
1012                         txbytes = bytes - i;
1013                 }
1014
1015                 /* link td and assign tx bytes */
1016                 if (i == buf_len) {
1017                         if (create_new_chain) {
1018                                 req->td_data->next = dma_addr;
1019                         } else {
1020                                 /* req->td_data->next = virt_to_phys(td); */
1021                         }
1022                         /* write tx bytes */
1023                         if (ep->in) {
1024                                 /* first desc */
1025                                 req->td_data->status =
1026                                         AMD_ADDBITS(req->td_data->status,
1027                                                         ep->ep.maxpacket,
1028                                                         UDC_DMA_IN_STS_TXBYTES);
1029                                 /* second desc */
1030                                 td->status = AMD_ADDBITS(td->status,
1031                                                         txbytes,
1032                                                         UDC_DMA_IN_STS_TXBYTES);
1033                         }
1034                 } else {
1035                         if (create_new_chain) {
1036                                 last->next = dma_addr;
1037                         } else {
1038                                 /* last->next = virt_to_phys(td); */
1039                         }
1040                         if (ep->in) {
1041                                 /* write tx bytes */
1042                                 td->status = AMD_ADDBITS(td->status,
1043                                                         txbytes,
1044                                                         UDC_DMA_IN_STS_TXBYTES);
1045                         }
1046                 }
1047                 last = td;
1048         }
1049         /* set last bit */
1050         if (td) {
1051                 td->status |= AMD_BIT(UDC_DMA_IN_STS_L);
1052                 /* last desc. points to itself */
1053                 req->td_data_last = td;
1054         }
1055
1056         return 0;
1057 }
1058
1059 /* Enabling RX DMA */
1060 static void udc_set_rde(struct udc *dev)
1061 {
1062         u32 tmp;
1063
1064         VDBG(dev, "udc_set_rde()\n");
1065         /* stop RDE timer */
1066         if (timer_pending(&udc_timer)) {
1067                 set_rde = 0;
1068                 mod_timer(&udc_timer, jiffies - 1);
1069         }
1070         /* set RDE */
1071         tmp = readl(&dev->regs->ctl);
1072         tmp |= AMD_BIT(UDC_DEVCTL_RDE);
1073         writel(tmp, &dev->regs->ctl);
1074 }
1075
1076 /* Queues a request packet, called by gadget driver */
1077 static int
1078 udc_queue(struct usb_ep *usbep, struct usb_request *usbreq, gfp_t gfp)
1079 {
1080         int                     retval = 0;
1081         u8                      open_rxfifo = 0;
1082         unsigned long           iflags;
1083         struct udc_ep           *ep;
1084         struct udc_request      *req;
1085         struct udc              *dev;
1086         u32                     tmp;
1087
1088         /* check the inputs */
1089         req = container_of(usbreq, struct udc_request, req);
1090
1091         if (!usbep || !usbreq || !usbreq->complete || !usbreq->buf
1092                         || !list_empty(&req->queue))
1093                 return -EINVAL;
1094
1095         ep = container_of(usbep, struct udc_ep, ep);
1096         if (!ep->desc && (ep->num != 0 && ep->num != UDC_EP0OUT_IX))
1097                 return -EINVAL;
1098
1099         VDBG(ep->dev, "udc_queue(): ep%d-in=%d\n", ep->num, ep->in);
1100         dev = ep->dev;
1101
1102         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
1103                 return -ESHUTDOWN;
1104
1105         /* map dma (usually done before) */
1106         if (ep->dma && usbreq->length != 0
1107                         && (usbreq->dma == DMA_DONT_USE || usbreq->dma == 0)) {
1108                 VDBG(dev, "DMA map req %p\n", req);
1109                 if (ep->in)
1110                         usbreq->dma = pci_map_single(dev->pdev,
1111                                                 usbreq->buf,
1112                                                 usbreq->length,
1113                                                 PCI_DMA_TODEVICE);
1114                 else
1115                         usbreq->dma = pci_map_single(dev->pdev,
1116                                                 usbreq->buf,
1117                                                 usbreq->length,
1118                                                 PCI_DMA_FROMDEVICE);
1119                 req->dma_mapping = 1;
1120         }
1121
1122         VDBG(dev, "%s queue req %p, len %d req->td_data=%p buf %p\n",
1123                         usbep->name, usbreq, usbreq->length,
1124                         req->td_data, usbreq->buf);
1125
1126         spin_lock_irqsave(&dev->lock, iflags);
1127         usbreq->actual = 0;
1128         usbreq->status = -EINPROGRESS;
1129         req->dma_done = 0;
1130
1131         /* on empty queue just do first transfer */
1132         if (list_empty(&ep->queue)) {
1133                 /* zlp */
1134                 if (usbreq->length == 0) {
1135                         /* IN zlp's are handled by hardware */
1136                         complete_req(ep, req, 0);
1137                         VDBG(dev, "%s: zlp\n", ep->ep.name);
1138                         /*
1139                          * if set_config or set_intf is waiting for ack by zlp
1140                          * then set CSR_DONE
1141                          */
1142                         if (dev->set_cfg_not_acked) {
1143                                 tmp = readl(&dev->regs->ctl);
1144                                 tmp |= AMD_BIT(UDC_DEVCTL_CSR_DONE);
1145                                 writel(tmp, &dev->regs->ctl);
1146                                 dev->set_cfg_not_acked = 0;
1147                         }
1148                         /* setup command is ACK'ed now by zlp */
1149                         if (dev->waiting_zlp_ack_ep0in) {
1150                                 /* clear NAK by writing CNAK in EP0_IN */
1151                                 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
1152                                 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1153                                 writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
1154                                 dev->ep[UDC_EP0IN_IX].naking = 0;
1155                                 UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX],
1156                                                         UDC_EP0IN_IX);
1157                                 dev->waiting_zlp_ack_ep0in = 0;
1158                         }
1159                         goto finished;
1160                 }
1161                 if (ep->dma) {
1162                         retval = prep_dma(ep, req, gfp);
1163                         if (retval != 0)
1164                                 goto finished;
1165                         /* write desc pointer to enable DMA */
1166                         if (ep->in) {
1167                                 /* set HOST READY */
1168                                 req->td_data->status =
1169                                         AMD_ADDBITS(req->td_data->status,
1170                                                 UDC_DMA_IN_STS_BS_HOST_READY,
1171                                                 UDC_DMA_IN_STS_BS);
1172                         }
1173
1174                         /* disabled rx dma while descriptor update */
1175                         if (!ep->in) {
1176                                 /* stop RDE timer */
1177                                 if (timer_pending(&udc_timer)) {
1178                                         set_rde = 0;
1179                                         mod_timer(&udc_timer, jiffies - 1);
1180                                 }
1181                                 /* clear RDE */
1182                                 tmp = readl(&dev->regs->ctl);
1183                                 tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_RDE);
1184                                 writel(tmp, &dev->regs->ctl);
1185                                 open_rxfifo = 1;
1186
1187                                 /*
1188                                  * if BNA occurred then let BNA dummy desc.
1189                                  * point to current desc.
1190                                  */
1191                                 if (ep->bna_occurred) {
1192                                         VDBG(dev, "copy to BNA dummy desc.\n");
1193                                         memcpy(ep->bna_dummy_req->td_data,
1194                                                 req->td_data,
1195                                                 sizeof(struct udc_data_dma));
1196                                 }
1197                         }
1198                         /* write desc pointer */
1199                         writel(req->td_phys, &ep->regs->desptr);
1200
1201                         /* clear NAK by writing CNAK */
1202                         if (ep->naking) {
1203                                 tmp = readl(&ep->regs->ctl);
1204                                 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1205                                 writel(tmp, &ep->regs->ctl);
1206                                 ep->naking = 0;
1207                                 UDC_QUEUE_CNAK(ep, ep->num);
1208                         }
1209
1210                         if (ep->in) {
1211                                 /* enable ep irq */
1212                                 tmp = readl(&dev->regs->ep_irqmsk);
1213                                 tmp &= AMD_UNMASK_BIT(ep->num);
1214                                 writel(tmp, &dev->regs->ep_irqmsk);
1215                         }
1216                 }
1217
1218         } else if (ep->dma) {
1219
1220                 /*
1221                  * prep_dma not used for OUT ep's, this is not possible
1222                  * for PPB modes, because of chain creation reasons
1223                  */
1224                 if (ep->in) {
1225                         retval = prep_dma(ep, req, gfp);
1226                         if (retval != 0)
1227                                 goto finished;
1228                 }
1229         }
1230         VDBG(dev, "list_add\n");
1231         /* add request to ep queue */
1232         if (req) {
1233
1234                 list_add_tail(&req->queue, &ep->queue);
1235
1236                 /* open rxfifo if out data queued */
1237                 if (open_rxfifo) {
1238                         /* enable DMA */
1239                         req->dma_going = 1;
1240                         udc_set_rde(dev);
1241                         if (ep->num != UDC_EP0OUT_IX)
1242                                 dev->data_ep_queued = 1;
1243                 }
1244                 /* stop OUT naking */
1245                 if (!ep->in) {
1246                         if (!use_dma && udc_rxfifo_pending) {
1247                                 DBG(dev, "udc_queue(): pending bytes in "
1248                                         "rxfifo after nyet\n");
1249                                 /*
1250                                  * read pending bytes afer nyet:
1251                                  * referring to isr
1252                                  */
1253                                 if (udc_rxfifo_read(ep, req)) {
1254                                         /* finish */
1255                                         complete_req(ep, req, 0);
1256                                 }
1257                                 udc_rxfifo_pending = 0;
1258
1259                         }
1260                 }
1261         }
1262
1263 finished:
1264         spin_unlock_irqrestore(&dev->lock, iflags);
1265         return retval;
1266 }
1267
1268 /* Empty request queue of an endpoint; caller holds spinlock */
1269 static void empty_req_queue(struct udc_ep *ep)
1270 {
1271         struct udc_request      *req;
1272
1273         ep->halted = 1;
1274         while (!list_empty(&ep->queue)) {
1275                 req = list_entry(ep->queue.next,
1276                         struct udc_request,
1277                         queue);
1278                 complete_req(ep, req, -ESHUTDOWN);
1279         }
1280 }
1281
1282 /* Dequeues a request packet, called by gadget driver */
1283 static int udc_dequeue(struct usb_ep *usbep, struct usb_request *usbreq)
1284 {
1285         struct udc_ep           *ep;
1286         struct udc_request      *req;
1287         unsigned                halted;
1288         unsigned long           iflags;
1289
1290         ep = container_of(usbep, struct udc_ep, ep);
1291         if (!usbep || !usbreq || (!ep->desc && (ep->num != 0
1292                                 && ep->num != UDC_EP0OUT_IX)))
1293                 return -EINVAL;
1294
1295         req = container_of(usbreq, struct udc_request, req);
1296
1297         spin_lock_irqsave(&ep->dev->lock, iflags);
1298         halted = ep->halted;
1299         ep->halted = 1;
1300         /* request in processing or next one */
1301         if (ep->queue.next == &req->queue) {
1302                 if (ep->dma && req->dma_going) {
1303                         if (ep->in)
1304                                 ep->cancel_transfer = 1;
1305                         else {
1306                                 u32 tmp;
1307                                 u32 dma_sts;
1308                                 /* stop potential receive DMA */
1309                                 tmp = readl(&udc->regs->ctl);
1310                                 writel(tmp & AMD_UNMASK_BIT(UDC_DEVCTL_RDE),
1311                                                         &udc->regs->ctl);
1312                                 /*
1313                                  * Cancel transfer later in ISR
1314                                  * if descriptor was touched.
1315                                  */
1316                                 dma_sts = AMD_GETBITS(req->td_data->status,
1317                                                         UDC_DMA_OUT_STS_BS);
1318                                 if (dma_sts != UDC_DMA_OUT_STS_BS_HOST_READY)
1319                                         ep->cancel_transfer = 1;
1320                                 else {
1321                                         udc_init_bna_dummy(ep->req);
1322                                         writel(ep->bna_dummy_req->td_phys,
1323                                                 &ep->regs->desptr);
1324                                 }
1325                                 writel(tmp, &udc->regs->ctl);
1326                         }
1327                 }
1328         }
1329         complete_req(ep, req, -ECONNRESET);
1330         ep->halted = halted;
1331
1332         spin_unlock_irqrestore(&ep->dev->lock, iflags);
1333         return 0;
1334 }
1335
1336 /* Halt or clear halt of endpoint */
1337 static int
1338 udc_set_halt(struct usb_ep *usbep, int halt)
1339 {
1340         struct udc_ep   *ep;
1341         u32 tmp;
1342         unsigned long iflags;
1343         int retval = 0;
1344
1345         if (!usbep)
1346                 return -EINVAL;
1347
1348         pr_debug("set_halt %s: halt=%d\n", usbep->name, halt);
1349
1350         ep = container_of(usbep, struct udc_ep, ep);
1351         if (!ep->desc && (ep->num != 0 && ep->num != UDC_EP0OUT_IX))
1352                 return -EINVAL;
1353         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1354                 return -ESHUTDOWN;
1355
1356         spin_lock_irqsave(&udc_stall_spinlock, iflags);
1357         /* halt or clear halt */
1358         if (halt) {
1359                 if (ep->num == 0)
1360                         ep->dev->stall_ep0in = 1;
1361                 else {
1362                         /*
1363                          * set STALL
1364                          * rxfifo empty not taken into acount
1365                          */
1366                         tmp = readl(&ep->regs->ctl);
1367                         tmp |= AMD_BIT(UDC_EPCTL_S);
1368                         writel(tmp, &ep->regs->ctl);
1369                         ep->halted = 1;
1370
1371                         /* setup poll timer */
1372                         if (!timer_pending(&udc_pollstall_timer)) {
1373                                 udc_pollstall_timer.expires = jiffies +
1374                                         HZ * UDC_POLLSTALL_TIMER_USECONDS
1375                                         / (1000 * 1000);
1376                                 if (!stop_pollstall_timer) {
1377                                         DBG(ep->dev, "start polltimer\n");
1378                                         add_timer(&udc_pollstall_timer);
1379                                 }
1380                         }
1381                 }
1382         } else {
1383                 /* ep is halted by set_halt() before */
1384                 if (ep->halted) {
1385                         tmp = readl(&ep->regs->ctl);
1386                         /* clear stall bit */
1387                         tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
1388                         /* clear NAK by writing CNAK */
1389                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1390                         writel(tmp, &ep->regs->ctl);
1391                         ep->halted = 0;
1392                         UDC_QUEUE_CNAK(ep, ep->num);
1393                 }
1394         }
1395         spin_unlock_irqrestore(&udc_stall_spinlock, iflags);
1396         return retval;
1397 }
1398
1399 /* gadget interface */
1400 static const struct usb_ep_ops udc_ep_ops = {
1401         .enable         = udc_ep_enable,
1402         .disable        = udc_ep_disable,
1403
1404         .alloc_request  = udc_alloc_request,
1405         .free_request   = udc_free_request,
1406
1407         .queue          = udc_queue,
1408         .dequeue        = udc_dequeue,
1409
1410         .set_halt       = udc_set_halt,
1411         /* fifo ops not implemented */
1412 };
1413
1414 /*-------------------------------------------------------------------------*/
1415
1416 /* Get frame counter (not implemented) */
1417 static int udc_get_frame(struct usb_gadget *gadget)
1418 {
1419         return -EOPNOTSUPP;
1420 }
1421
1422 /* Remote wakeup gadget interface */
1423 static int udc_wakeup(struct usb_gadget *gadget)
1424 {
1425         struct udc              *dev;
1426
1427         if (!gadget)
1428                 return -EINVAL;
1429         dev = container_of(gadget, struct udc, gadget);
1430         udc_remote_wakeup(dev);
1431
1432         return 0;
1433 }
1434
1435 /* gadget operations */
1436 static const struct usb_gadget_ops udc_ops = {
1437         .wakeup         = udc_wakeup,
1438         .get_frame      = udc_get_frame,
1439 };
1440
1441 /* Setups endpoint parameters, adds endpoints to linked list */
1442 static void make_ep_lists(struct udc *dev)
1443 {
1444         /* make gadget ep lists */
1445         INIT_LIST_HEAD(&dev->gadget.ep_list);
1446         list_add_tail(&dev->ep[UDC_EPIN_STATUS_IX].ep.ep_list,
1447                                                 &dev->gadget.ep_list);
1448         list_add_tail(&dev->ep[UDC_EPIN_IX].ep.ep_list,
1449                                                 &dev->gadget.ep_list);
1450         list_add_tail(&dev->ep[UDC_EPOUT_IX].ep.ep_list,
1451                                                 &dev->gadget.ep_list);
1452
1453         /* fifo config */
1454         dev->ep[UDC_EPIN_STATUS_IX].fifo_depth = UDC_EPIN_SMALLINT_BUFF_SIZE;
1455         if (dev->gadget.speed == USB_SPEED_FULL)
1456                 dev->ep[UDC_EPIN_IX].fifo_depth = UDC_FS_EPIN_BUFF_SIZE;
1457         else if (dev->gadget.speed == USB_SPEED_HIGH)
1458                 dev->ep[UDC_EPIN_IX].fifo_depth = hs_tx_buf;
1459         dev->ep[UDC_EPOUT_IX].fifo_depth = UDC_RXFIFO_SIZE;
1460 }
1461
1462 /* init registers at driver load time */
1463 static int startup_registers(struct udc *dev)
1464 {
1465         u32 tmp;
1466
1467         /* init controller by soft reset */
1468         udc_soft_reset(dev);
1469
1470         /* mask not needed interrupts */
1471         udc_mask_unused_interrupts(dev);
1472
1473         /* put into initial config */
1474         udc_basic_init(dev);
1475         /* link up all endpoints */
1476         udc_setup_endpoints(dev);
1477
1478         /* program speed */
1479         tmp = readl(&dev->regs->cfg);
1480         if (use_fullspeed) {
1481                 tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_FS, UDC_DEVCFG_SPD);
1482         } else {
1483                 tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_HS, UDC_DEVCFG_SPD);
1484         }
1485         writel(tmp, &dev->regs->cfg);
1486
1487         return 0;
1488 }
1489
1490 /* Inits UDC context */
1491 static void udc_basic_init(struct udc *dev)
1492 {
1493         u32     tmp;
1494
1495         DBG(dev, "udc_basic_init()\n");
1496
1497         dev->gadget.speed = USB_SPEED_UNKNOWN;
1498
1499         /* stop RDE timer */
1500         if (timer_pending(&udc_timer)) {
1501                 set_rde = 0;
1502                 mod_timer(&udc_timer, jiffies - 1);
1503         }
1504         /* stop poll stall timer */
1505         if (timer_pending(&udc_pollstall_timer)) {
1506                 mod_timer(&udc_pollstall_timer, jiffies - 1);
1507         }
1508         /* disable DMA */
1509         tmp = readl(&dev->regs->ctl);
1510         tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_RDE);
1511         tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_TDE);
1512         writel(tmp, &dev->regs->ctl);
1513
1514         /* enable dynamic CSR programming */
1515         tmp = readl(&dev->regs->cfg);
1516         tmp |= AMD_BIT(UDC_DEVCFG_CSR_PRG);
1517         /* set self powered */
1518         tmp |= AMD_BIT(UDC_DEVCFG_SP);
1519         /* set remote wakeupable */
1520         tmp |= AMD_BIT(UDC_DEVCFG_RWKP);
1521         writel(tmp, &dev->regs->cfg);
1522
1523         make_ep_lists(dev);
1524
1525         dev->data_ep_enabled = 0;
1526         dev->data_ep_queued = 0;
1527 }
1528
1529 /* Sets initial endpoint parameters */
1530 static void udc_setup_endpoints(struct udc *dev)
1531 {
1532         struct udc_ep   *ep;
1533         u32     tmp;
1534         u32     reg;
1535
1536         DBG(dev, "udc_setup_endpoints()\n");
1537
1538         /* read enum speed */
1539         tmp = readl(&dev->regs->sts);
1540         tmp = AMD_GETBITS(tmp, UDC_DEVSTS_ENUM_SPEED);
1541         if (tmp == UDC_DEVSTS_ENUM_SPEED_HIGH) {
1542                 dev->gadget.speed = USB_SPEED_HIGH;
1543         } else if (tmp == UDC_DEVSTS_ENUM_SPEED_FULL) {
1544                 dev->gadget.speed = USB_SPEED_FULL;
1545         }
1546
1547         /* set basic ep parameters */
1548         for (tmp = 0; tmp < UDC_EP_NUM; tmp++) {
1549                 ep = &dev->ep[tmp];
1550                 ep->dev = dev;
1551                 ep->ep.name = ep_string[tmp];
1552                 ep->num = tmp;
1553                 /* txfifo size is calculated at enable time */
1554                 ep->txfifo = dev->txfifo;
1555
1556                 /* fifo size */
1557                 if (tmp < UDC_EPIN_NUM) {
1558                         ep->fifo_depth = UDC_TXFIFO_SIZE;
1559                         ep->in = 1;
1560                 } else {
1561                         ep->fifo_depth = UDC_RXFIFO_SIZE;
1562                         ep->in = 0;
1563
1564                 }
1565                 ep->regs = &dev->ep_regs[tmp];
1566                 /*
1567                  * ep will be reset only if ep was not enabled before to avoid
1568                  * disabling ep interrupts when ENUM interrupt occurs but ep is
1569                  * not enabled by gadget driver
1570                  */
1571                 if (!ep->desc) {
1572                         ep_init(dev->regs, ep);
1573                 }
1574
1575                 if (use_dma) {
1576                         /*
1577                          * ep->dma is not really used, just to indicate that
1578                          * DMA is active: remove this
1579                          * dma regs = dev control regs
1580                          */
1581                         ep->dma = &dev->regs->ctl;
1582
1583                         /* nak OUT endpoints until enable - not for ep0 */
1584                         if (tmp != UDC_EP0IN_IX && tmp != UDC_EP0OUT_IX
1585                                                 && tmp > UDC_EPIN_NUM) {
1586                                 /* set NAK */
1587                                 reg = readl(&dev->ep[tmp].regs->ctl);
1588                                 reg |= AMD_BIT(UDC_EPCTL_SNAK);
1589                                 writel(reg, &dev->ep[tmp].regs->ctl);
1590                                 dev->ep[tmp].naking = 1;
1591
1592                         }
1593                 }
1594         }
1595         /* EP0 max packet */
1596         if (dev->gadget.speed == USB_SPEED_FULL) {
1597                 dev->ep[UDC_EP0IN_IX].ep.maxpacket = UDC_FS_EP0IN_MAX_PKT_SIZE;
1598                 dev->ep[UDC_EP0OUT_IX].ep.maxpacket =
1599                                                 UDC_FS_EP0OUT_MAX_PKT_SIZE;
1600         } else if (dev->gadget.speed == USB_SPEED_HIGH) {
1601                 dev->ep[UDC_EP0IN_IX].ep.maxpacket = UDC_EP0IN_MAX_PKT_SIZE;
1602                 dev->ep[UDC_EP0OUT_IX].ep.maxpacket = UDC_EP0OUT_MAX_PKT_SIZE;
1603         }
1604
1605         /*
1606          * with suspend bug workaround, ep0 params for gadget driver
1607          * are set at gadget driver bind() call
1608          */
1609         dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IX].ep;
1610         dev->ep[UDC_EP0IN_IX].halted = 0;
1611         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
1612
1613         /* init cfg/alt/int */
1614         dev->cur_config = 0;
1615         dev->cur_intf = 0;
1616         dev->cur_alt = 0;
1617 }
1618
1619 /* Bringup after Connect event, initial bringup to be ready for ep0 events */
1620 static void usb_connect(struct udc *dev)
1621 {
1622
1623         dev_info(&dev->pdev->dev, "USB Connect\n");
1624
1625         dev->connected = 1;
1626
1627         /* put into initial config */
1628         udc_basic_init(dev);
1629
1630         /* enable device setup interrupts */
1631         udc_enable_dev_setup_interrupts(dev);
1632 }
1633
1634 /*
1635  * Calls gadget with disconnect event and resets the UDC and makes
1636  * initial bringup to be ready for ep0 events
1637  */
1638 static void usb_disconnect(struct udc *dev)
1639 {
1640
1641         dev_info(&dev->pdev->dev, "USB Disconnect\n");
1642
1643         dev->connected = 0;
1644
1645         /* mask interrupts */
1646         udc_mask_unused_interrupts(dev);
1647
1648         /* REVISIT there doesn't seem to be a point to having this
1649          * talk to a tasklet ... do it directly, we already hold
1650          * the spinlock needed to process the disconnect.
1651          */
1652
1653         tasklet_schedule(&disconnect_tasklet);
1654 }
1655
1656 /* Tasklet for disconnect to be outside of interrupt context */
1657 static void udc_tasklet_disconnect(unsigned long par)
1658 {
1659         struct udc *dev = (struct udc *)(*((struct udc **) par));
1660         u32 tmp;
1661
1662         DBG(dev, "Tasklet disconnect\n");
1663         spin_lock_irq(&dev->lock);
1664
1665         if (dev->driver) {
1666                 spin_unlock(&dev->lock);
1667                 dev->driver->disconnect(&dev->gadget);
1668                 spin_lock(&dev->lock);
1669
1670                 /* empty queues */
1671                 for (tmp = 0; tmp < UDC_EP_NUM; tmp++) {
1672                         empty_req_queue(&dev->ep[tmp]);
1673                 }
1674
1675         }
1676
1677         /* disable ep0 */
1678         ep_init(dev->regs,
1679                         &dev->ep[UDC_EP0IN_IX]);
1680
1681
1682         if (!soft_reset_occured) {
1683                 /* init controller by soft reset */
1684                 udc_soft_reset(dev);
1685                 soft_reset_occured++;
1686         }
1687
1688         /* re-enable dev interrupts */
1689         udc_enable_dev_setup_interrupts(dev);
1690         /* back to full speed ? */
1691         if (use_fullspeed) {
1692                 tmp = readl(&dev->regs->cfg);
1693                 tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_FS, UDC_DEVCFG_SPD);
1694                 writel(tmp, &dev->regs->cfg);
1695         }
1696
1697         spin_unlock_irq(&dev->lock);
1698 }
1699
1700 /* Reset the UDC core */
1701 static void udc_soft_reset(struct udc *dev)
1702 {
1703         unsigned long   flags;
1704
1705         DBG(dev, "Soft reset\n");
1706         /*
1707          * reset possible waiting interrupts, because int.
1708          * status is lost after soft reset,
1709          * ep int. status reset
1710          */
1711         writel(UDC_EPINT_MSK_DISABLE_ALL, &dev->regs->ep_irqsts);
1712         /* device int. status reset */
1713         writel(UDC_DEV_MSK_DISABLE, &dev->regs->irqsts);
1714
1715         spin_lock_irqsave(&udc_irq_spinlock, flags);
1716         writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg);
1717         readl(&dev->regs->cfg);
1718         spin_unlock_irqrestore(&udc_irq_spinlock, flags);
1719
1720 }
1721
1722 /* RDE timer callback to set RDE bit */
1723 static void udc_timer_function(unsigned long v)
1724 {
1725         u32 tmp;
1726
1727         spin_lock_irq(&udc_irq_spinlock);
1728
1729         if (set_rde > 0) {
1730                 /*
1731                  * open the fifo if fifo was filled on last timer call
1732                  * conditionally
1733                  */
1734                 if (set_rde > 1) {
1735                         /* set RDE to receive setup data */
1736                         tmp = readl(&udc->regs->ctl);
1737                         tmp |= AMD_BIT(UDC_DEVCTL_RDE);
1738                         writel(tmp, &udc->regs->ctl);
1739                         set_rde = -1;
1740                 } else if (readl(&udc->regs->sts)
1741                                 & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) {
1742                         /*
1743                          * if fifo empty setup polling, do not just
1744                          * open the fifo
1745                          */
1746                         udc_timer.expires = jiffies + HZ/UDC_RDE_TIMER_DIV;
1747                         if (!stop_timer) {
1748                                 add_timer(&udc_timer);
1749                         }
1750                 } else {
1751                         /*
1752                          * fifo contains data now, setup timer for opening
1753                          * the fifo when timer expires to be able to receive
1754                          * setup packets, when data packets gets queued by
1755                          * gadget layer then timer will forced to expire with
1756                          * set_rde=0 (RDE is set in udc_queue())
1757                          */
1758                         set_rde++;
1759                         /* debug: lhadmot_timer_start = 221070 */
1760                         udc_timer.expires = jiffies + HZ*UDC_RDE_TIMER_SECONDS;
1761                         if (!stop_timer) {
1762                                 add_timer(&udc_timer);
1763                         }
1764                 }
1765
1766         } else
1767                 set_rde = -1; /* RDE was set by udc_queue() */
1768         spin_unlock_irq(&udc_irq_spinlock);
1769         if (stop_timer)
1770                 complete(&on_exit);
1771
1772 }
1773
1774 /* Handle halt state, used in stall poll timer */
1775 static void udc_handle_halt_state(struct udc_ep *ep)
1776 {
1777         u32 tmp;
1778         /* set stall as long not halted */
1779         if (ep->halted == 1) {
1780                 tmp = readl(&ep->regs->ctl);
1781                 /* STALL cleared ? */
1782                 if (!(tmp & AMD_BIT(UDC_EPCTL_S))) {
1783                         /*
1784                          * FIXME: MSC spec requires that stall remains
1785                          * even on receivng of CLEAR_FEATURE HALT. So
1786                          * we would set STALL again here to be compliant.
1787                          * But with current mass storage drivers this does
1788                          * not work (would produce endless host retries).
1789                          * So we clear halt on CLEAR_FEATURE.
1790                          *
1791                         DBG(ep->dev, "ep %d: set STALL again\n", ep->num);
1792                         tmp |= AMD_BIT(UDC_EPCTL_S);
1793                         writel(tmp, &ep->regs->ctl);*/
1794
1795                         /* clear NAK by writing CNAK */
1796                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1797                         writel(tmp, &ep->regs->ctl);
1798                         ep->halted = 0;
1799                         UDC_QUEUE_CNAK(ep, ep->num);
1800                 }
1801         }
1802 }
1803
1804 /* Stall timer callback to poll S bit and set it again after */
1805 static void udc_pollstall_timer_function(unsigned long v)
1806 {
1807         struct udc_ep *ep;
1808         int halted = 0;
1809
1810         spin_lock_irq(&udc_stall_spinlock);
1811         /*
1812          * only one IN and OUT endpoints are handled
1813          * IN poll stall
1814          */
1815         ep = &udc->ep[UDC_EPIN_IX];
1816         udc_handle_halt_state(ep);
1817         if (ep->halted)
1818                 halted = 1;
1819         /* OUT poll stall */
1820         ep = &udc->ep[UDC_EPOUT_IX];
1821         udc_handle_halt_state(ep);
1822         if (ep->halted)
1823                 halted = 1;
1824
1825         /* setup timer again when still halted */
1826         if (!stop_pollstall_timer && halted) {
1827                 udc_pollstall_timer.expires = jiffies +
1828                                         HZ * UDC_POLLSTALL_TIMER_USECONDS
1829                                         / (1000 * 1000);
1830                 add_timer(&udc_pollstall_timer);
1831         }
1832         spin_unlock_irq(&udc_stall_spinlock);
1833
1834         if (stop_pollstall_timer)
1835                 complete(&on_pollstall_exit);
1836 }
1837
1838 /* Inits endpoint 0 so that SETUP packets are processed */
1839 static void activate_control_endpoints(struct udc *dev)
1840 {
1841         u32 tmp;
1842
1843         DBG(dev, "activate_control_endpoints\n");
1844
1845         /* flush fifo */
1846         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
1847         tmp |= AMD_BIT(UDC_EPCTL_F);
1848         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
1849
1850         /* set ep0 directions */
1851         dev->ep[UDC_EP0IN_IX].in = 1;
1852         dev->ep[UDC_EP0OUT_IX].in = 0;
1853
1854         /* set buffer size (tx fifo entries) of EP0_IN */
1855         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->bufin_framenum);
1856         if (dev->gadget.speed == USB_SPEED_FULL)
1857                 tmp = AMD_ADDBITS(tmp, UDC_FS_EPIN0_BUFF_SIZE,
1858                                         UDC_EPIN_BUFF_SIZE);
1859         else if (dev->gadget.speed == USB_SPEED_HIGH)
1860                 tmp = AMD_ADDBITS(tmp, UDC_EPIN0_BUFF_SIZE,
1861                                         UDC_EPIN_BUFF_SIZE);
1862         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->bufin_framenum);
1863
1864         /* set max packet size of EP0_IN */
1865         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->bufout_maxpkt);
1866         if (dev->gadget.speed == USB_SPEED_FULL)
1867                 tmp = AMD_ADDBITS(tmp, UDC_FS_EP0IN_MAX_PKT_SIZE,
1868                                         UDC_EP_MAX_PKT_SIZE);
1869         else if (dev->gadget.speed == USB_SPEED_HIGH)
1870                 tmp = AMD_ADDBITS(tmp, UDC_EP0IN_MAX_PKT_SIZE,
1871                                 UDC_EP_MAX_PKT_SIZE);
1872         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->bufout_maxpkt);
1873
1874         /* set max packet size of EP0_OUT */
1875         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->bufout_maxpkt);
1876         if (dev->gadget.speed == USB_SPEED_FULL)
1877                 tmp = AMD_ADDBITS(tmp, UDC_FS_EP0OUT_MAX_PKT_SIZE,
1878                                         UDC_EP_MAX_PKT_SIZE);
1879         else if (dev->gadget.speed == USB_SPEED_HIGH)
1880                 tmp = AMD_ADDBITS(tmp, UDC_EP0OUT_MAX_PKT_SIZE,
1881                                         UDC_EP_MAX_PKT_SIZE);
1882         writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->bufout_maxpkt);
1883
1884         /* set max packet size of EP0 in UDC CSR */
1885         tmp = readl(&dev->csr->ne[0]);
1886         if (dev->gadget.speed == USB_SPEED_FULL)
1887                 tmp = AMD_ADDBITS(tmp, UDC_FS_EP0OUT_MAX_PKT_SIZE,
1888                                         UDC_CSR_NE_MAX_PKT);
1889         else if (dev->gadget.speed == USB_SPEED_HIGH)
1890                 tmp = AMD_ADDBITS(tmp, UDC_EP0OUT_MAX_PKT_SIZE,
1891                                         UDC_CSR_NE_MAX_PKT);
1892         writel(tmp, &dev->csr->ne[0]);
1893
1894         if (use_dma) {
1895                 dev->ep[UDC_EP0OUT_IX].td->status |=
1896                         AMD_BIT(UDC_DMA_OUT_STS_L);
1897                 /* write dma desc address */
1898                 writel(dev->ep[UDC_EP0OUT_IX].td_stp_dma,
1899                         &dev->ep[UDC_EP0OUT_IX].regs->subptr);
1900                 writel(dev->ep[UDC_EP0OUT_IX].td_phys,
1901                         &dev->ep[UDC_EP0OUT_IX].regs->desptr);
1902                 /* stop RDE timer */
1903                 if (timer_pending(&udc_timer)) {
1904                         set_rde = 0;
1905                         mod_timer(&udc_timer, jiffies - 1);
1906                 }
1907                 /* stop pollstall timer */
1908                 if (timer_pending(&udc_pollstall_timer)) {
1909                         mod_timer(&udc_pollstall_timer, jiffies - 1);
1910                 }
1911                 /* enable DMA */
1912                 tmp = readl(&dev->regs->ctl);
1913                 tmp |= AMD_BIT(UDC_DEVCTL_MODE)
1914                                 | AMD_BIT(UDC_DEVCTL_RDE)
1915                                 | AMD_BIT(UDC_DEVCTL_TDE);
1916                 if (use_dma_bufferfill_mode) {
1917                         tmp |= AMD_BIT(UDC_DEVCTL_BF);
1918                 } else if (use_dma_ppb_du) {
1919                         tmp |= AMD_BIT(UDC_DEVCTL_DU);
1920                 }
1921                 writel(tmp, &dev->regs->ctl);
1922         }
1923
1924         /* clear NAK by writing CNAK for EP0IN */
1925         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
1926         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1927         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
1928         dev->ep[UDC_EP0IN_IX].naking = 0;
1929         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX], UDC_EP0IN_IX);
1930
1931         /* clear NAK by writing CNAK for EP0OUT */
1932         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
1933         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1934         writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
1935         dev->ep[UDC_EP0OUT_IX].naking = 0;
1936         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX], UDC_EP0OUT_IX);
1937 }
1938
1939 /* Make endpoint 0 ready for control traffic */
1940 static int setup_ep0(struct udc *dev)
1941 {
1942         activate_control_endpoints(dev);
1943         /* enable ep0 interrupts */
1944         udc_enable_ep0_interrupts(dev);
1945         /* enable device setup interrupts */
1946         udc_enable_dev_setup_interrupts(dev);
1947
1948         return 0;
1949 }
1950
1951 /* Called by gadget driver to register itself */
1952 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1953 {
1954         struct udc              *dev = udc;
1955         int                     retval;
1956         u32 tmp;
1957
1958         if (!driver || !driver->bind || !driver->setup
1959                         || driver->speed != USB_SPEED_HIGH)
1960                 return -EINVAL;
1961         if (!dev)
1962                 return -ENODEV;
1963         if (dev->driver)
1964                 return -EBUSY;
1965
1966         driver->driver.bus = NULL;
1967         dev->driver = driver;
1968         dev->gadget.dev.driver = &driver->driver;
1969
1970         retval = driver->bind(&dev->gadget);
1971
1972         /* Some gadget drivers use both ep0 directions.
1973          * NOTE: to gadget driver, ep0 is just one endpoint...
1974          */
1975         dev->ep[UDC_EP0OUT_IX].ep.driver_data =
1976                 dev->ep[UDC_EP0IN_IX].ep.driver_data;
1977
1978         if (retval) {
1979                 DBG(dev, "binding to %s returning %d\n",
1980                                 driver->driver.name, retval);
1981                 dev->driver = NULL;
1982                 dev->gadget.dev.driver = NULL;
1983                 return retval;
1984         }
1985
1986         /* get ready for ep0 traffic */
1987         setup_ep0(dev);
1988
1989         /* clear SD */
1990         tmp = readl(&dev->regs->ctl);
1991         tmp = tmp & AMD_CLEAR_BIT(UDC_DEVCTL_SD);
1992         writel(tmp, &dev->regs->ctl);
1993
1994         usb_connect(dev);
1995
1996         return 0;
1997 }
1998 EXPORT_SYMBOL(usb_gadget_register_driver);
1999
2000 /* shutdown requests and disconnect from gadget */
2001 static void
2002 shutdown(struct udc *dev, struct usb_gadget_driver *driver)
2003 __releases(dev->lock)
2004 __acquires(dev->lock)
2005 {
2006         int tmp;
2007
2008         /* empty queues and init hardware */
2009         udc_basic_init(dev);
2010         for (tmp = 0; tmp < UDC_EP_NUM; tmp++) {
2011                 empty_req_queue(&dev->ep[tmp]);
2012         }
2013
2014         if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
2015                 spin_unlock(&dev->lock);
2016                 driver->disconnect(&dev->gadget);
2017                 spin_lock(&dev->lock);
2018         }
2019         /* init */
2020         udc_setup_endpoints(dev);
2021 }
2022
2023 /* Called by gadget driver to unregister itself */
2024 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
2025 {
2026         struct udc      *dev = udc;
2027         unsigned long   flags;
2028         u32 tmp;
2029
2030         if (!dev)
2031                 return -ENODEV;
2032         if (!driver || driver != dev->driver || !driver->unbind)
2033                 return -EINVAL;
2034
2035         spin_lock_irqsave(&dev->lock, flags);
2036         udc_mask_unused_interrupts(dev);
2037         shutdown(dev, driver);
2038         spin_unlock_irqrestore(&dev->lock, flags);
2039
2040         driver->unbind(&dev->gadget);
2041         dev->gadget.dev.driver = NULL;
2042         dev->driver = NULL;
2043
2044         /* set SD */
2045         tmp = readl(&dev->regs->ctl);
2046         tmp |= AMD_BIT(UDC_DEVCTL_SD);
2047         writel(tmp, &dev->regs->ctl);
2048
2049
2050         DBG(dev, "%s: unregistered\n", driver->driver.name);
2051
2052         return 0;
2053 }
2054 EXPORT_SYMBOL(usb_gadget_unregister_driver);
2055
2056
2057 /* Clear pending NAK bits */
2058 static void udc_process_cnak_queue(struct udc *dev)
2059 {
2060         u32 tmp;
2061         u32 reg;
2062
2063         /* check epin's */
2064         DBG(dev, "CNAK pending queue processing\n");
2065         for (tmp = 0; tmp < UDC_EPIN_NUM_USED; tmp++) {
2066                 if (cnak_pending & (1 << tmp)) {
2067                         DBG(dev, "CNAK pending for ep%d\n", tmp);
2068                         /* clear NAK by writing CNAK */
2069                         reg = readl(&dev->ep[tmp].regs->ctl);
2070                         reg |= AMD_BIT(UDC_EPCTL_CNAK);
2071                         writel(reg, &dev->ep[tmp].regs->ctl);
2072                         dev->ep[tmp].naking = 0;
2073                         UDC_QUEUE_CNAK(&dev->ep[tmp], dev->ep[tmp].num);
2074                 }
2075         }
2076         /* ...  and ep0out */
2077         if (cnak_pending & (1 << UDC_EP0OUT_IX)) {
2078                 DBG(dev, "CNAK pending for ep%d\n", UDC_EP0OUT_IX);
2079                 /* clear NAK by writing CNAK */
2080                 reg = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
2081                 reg |= AMD_BIT(UDC_EPCTL_CNAK);
2082                 writel(reg, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
2083                 dev->ep[UDC_EP0OUT_IX].naking = 0;
2084                 UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX],
2085                                 dev->ep[UDC_EP0OUT_IX].num);
2086         }
2087 }
2088
2089 /* Enabling RX DMA after setup packet */
2090 static void udc_ep0_set_rde(struct udc *dev)
2091 {
2092         if (use_dma) {
2093                 /*
2094                  * only enable RXDMA when no data endpoint enabled
2095                  * or data is queued
2096                  */
2097                 if (!dev->data_ep_enabled || dev->data_ep_queued) {
2098                         udc_set_rde(dev);
2099                 } else {
2100                         /*
2101                          * setup timer for enabling RDE (to not enable
2102                          * RXFIFO DMA for data endpoints to early)
2103                          */
2104                         if (set_rde != 0 && !timer_pending(&udc_timer)) {
2105                                 udc_timer.expires =
2106                                         jiffies + HZ/UDC_RDE_TIMER_DIV;
2107                                 set_rde = 1;
2108                                 if (!stop_timer) {
2109                                         add_timer(&udc_timer);
2110                                 }
2111                         }
2112                 }
2113         }
2114 }
2115
2116
2117 /* Interrupt handler for data OUT traffic */
2118 static irqreturn_t udc_data_out_isr(struct udc *dev, int ep_ix)
2119 {
2120         irqreturn_t             ret_val = IRQ_NONE;
2121         u32                     tmp;
2122         struct udc_ep           *ep;
2123         struct udc_request      *req;
2124         unsigned int            count;
2125         struct udc_data_dma     *td = NULL;
2126         unsigned                dma_done;
2127
2128         VDBG(dev, "ep%d irq\n", ep_ix);
2129         ep = &dev->ep[ep_ix];
2130
2131         tmp = readl(&ep->regs->sts);
2132         if (use_dma) {
2133                 /* BNA event ? */
2134                 if (tmp & AMD_BIT(UDC_EPSTS_BNA)) {
2135                         DBG(dev, "BNA ep%dout occured - DESPTR = %x \n",
2136                                         ep->num, readl(&ep->regs->desptr));
2137                         /* clear BNA */
2138                         writel(tmp | AMD_BIT(UDC_EPSTS_BNA), &ep->regs->sts);
2139                         if (!ep->cancel_transfer)
2140                                 ep->bna_occurred = 1;
2141                         else
2142                                 ep->cancel_transfer = 0;
2143                         ret_val = IRQ_HANDLED;
2144                         goto finished;
2145                 }
2146         }
2147         /* HE event ? */
2148         if (tmp & AMD_BIT(UDC_EPSTS_HE)) {
2149                 dev_err(&dev->pdev->dev, "HE ep%dout occured\n", ep->num);
2150
2151                 /* clear HE */
2152                 writel(tmp | AMD_BIT(UDC_EPSTS_HE), &ep->regs->sts);
2153                 ret_val = IRQ_HANDLED;
2154                 goto finished;
2155         }
2156
2157         if (!list_empty(&ep->queue)) {
2158
2159                 /* next request */
2160                 req = list_entry(ep->queue.next,
2161                         struct udc_request, queue);
2162         } else {
2163                 req = NULL;
2164                 udc_rxfifo_pending = 1;
2165         }
2166         VDBG(dev, "req = %p\n", req);
2167         /* fifo mode */
2168         if (!use_dma) {
2169
2170                 /* read fifo */
2171                 if (req && udc_rxfifo_read(ep, req)) {
2172                         ret_val = IRQ_HANDLED;
2173
2174                         /* finish */
2175                         complete_req(ep, req, 0);
2176                         /* next request */
2177                         if (!list_empty(&ep->queue) && !ep->halted) {
2178                                 req = list_entry(ep->queue.next,
2179                                         struct udc_request, queue);
2180                         } else
2181                                 req = NULL;
2182                 }
2183
2184         /* DMA */
2185         } else if (!ep->cancel_transfer && req != NULL) {
2186                 ret_val = IRQ_HANDLED;
2187
2188                 /* check for DMA done */
2189                 if (!use_dma_ppb) {
2190                         dma_done = AMD_GETBITS(req->td_data->status,
2191                                                 UDC_DMA_OUT_STS_BS);
2192                 /* packet per buffer mode - rx bytes */
2193                 } else {
2194                         /*
2195                          * if BNA occurred then recover desc. from
2196                          * BNA dummy desc.
2197                          */
2198                         if (ep->bna_occurred) {
2199                                 VDBG(dev, "Recover desc. from BNA dummy\n");
2200                                 memcpy(req->td_data, ep->bna_dummy_req->td_data,
2201                                                 sizeof(struct udc_data_dma));
2202                                 ep->bna_occurred = 0;
2203                                 udc_init_bna_dummy(ep->req);
2204                         }
2205                         td = udc_get_last_dma_desc(req);
2206                         dma_done = AMD_GETBITS(td->status, UDC_DMA_OUT_STS_BS);
2207                 }
2208                 if (dma_done == UDC_DMA_OUT_STS_BS_DMA_DONE) {
2209                         /* buffer fill mode - rx bytes */
2210                         if (!use_dma_ppb) {
2211                                 /* received number bytes */
2212                                 count = AMD_GETBITS(req->td_data->status,
2213                                                 UDC_DMA_OUT_STS_RXBYTES);
2214                                 VDBG(dev, "rx bytes=%u\n", count);
2215                         /* packet per buffer mode - rx bytes */
2216                         } else {
2217                                 VDBG(dev, "req->td_data=%p\n", req->td_data);
2218                                 VDBG(dev, "last desc = %p\n", td);
2219                                 /* received number bytes */
2220                                 if (use_dma_ppb_du) {
2221                                         /* every desc. counts bytes */
2222                                         count = udc_get_ppbdu_rxbytes(req);
2223                                 } else {
2224                                         /* last desc. counts bytes */
2225                                         count = AMD_GETBITS(td->status,
2226                                                 UDC_DMA_OUT_STS_RXBYTES);
2227                                         if (!count && req->req.length
2228                                                 == UDC_DMA_MAXPACKET) {
2229                                                 /*
2230                                                  * on 64k packets the RXBYTES
2231                                                  * field is zero
2232                                                  */
2233                                                 count = UDC_DMA_MAXPACKET;
2234                                         }
2235                                 }
2236                                 VDBG(dev, "last desc rx bytes=%u\n", count);
2237                         }
2238
2239                         tmp = req->req.length - req->req.actual;
2240                         if (count > tmp) {
2241                                 if ((tmp % ep->ep.maxpacket) != 0) {
2242                                         DBG(dev, "%s: rx %db, space=%db\n",
2243                                                 ep->ep.name, count, tmp);
2244                                         req->req.status = -EOVERFLOW;
2245                                 }
2246                                 count = tmp;
2247                         }
2248                         req->req.actual += count;
2249                         req->dma_going = 0;
2250                         /* complete request */
2251                         complete_req(ep, req, 0);
2252
2253                         /* next request */
2254                         if (!list_empty(&ep->queue) && !ep->halted) {
2255                                 req = list_entry(ep->queue.next,
2256                                         struct udc_request,
2257                                         queue);
2258                                 /*
2259                                  * DMA may be already started by udc_queue()
2260                                  * called by gadget drivers completion
2261                                  * routine. This happens when queue
2262                                  * holds one request only.
2263                                  */
2264                                 if (req->dma_going == 0) {
2265                                         /* next dma */
2266                                         if (prep_dma(ep, req, GFP_ATOMIC) != 0)
2267                                                 goto finished;
2268                                         /* write desc pointer */
2269                                         writel(req->td_phys,
2270                                                 &ep->regs->desptr);
2271                                         req->dma_going = 1;
2272                                         /* enable DMA */
2273                                         udc_set_rde(dev);
2274                                 }
2275                         } else {
2276                                 /*
2277                                  * implant BNA dummy descriptor to allow
2278                                  * RXFIFO opening by RDE
2279                                  */
2280                                 if (ep->bna_dummy_req) {
2281                                         /* write desc pointer */
2282                                         writel(ep->bna_dummy_req->td_phys,
2283                                                 &ep->regs->desptr);
2284                                         ep->bna_occurred = 0;
2285                                 }
2286
2287                                 /*
2288                                  * schedule timer for setting RDE if queue
2289                                  * remains empty to allow ep0 packets pass
2290                                  * through
2291                                  */
2292                                 if (set_rde != 0
2293                                                 && !timer_pending(&udc_timer)) {
2294                                         udc_timer.expires =
2295                                                 jiffies
2296                                                 + HZ*UDC_RDE_TIMER_SECONDS;
2297                                         set_rde = 1;
2298                                         if (!stop_timer) {
2299                                                 add_timer(&udc_timer);
2300                                         }
2301                                 }
2302                                 if (ep->num != UDC_EP0OUT_IX)
2303                                         dev->data_ep_queued = 0;
2304                         }
2305
2306                 } else {
2307                         /*
2308                         * RX DMA must be reenabled for each desc in PPBDU mode
2309                         * and must be enabled for PPBNDU mode in case of BNA
2310                         */
2311                         udc_set_rde(dev);
2312                 }
2313
2314         } else if (ep->cancel_transfer) {
2315                 ret_val = IRQ_HANDLED;
2316                 ep->cancel_transfer = 0;
2317         }
2318
2319         /* check pending CNAKS */
2320         if (cnak_pending) {
2321                 /* CNAk processing when rxfifo empty only */
2322                 if (readl(&dev->regs->sts) & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) {
2323                         udc_process_cnak_queue(dev);
2324                 }
2325         }
2326
2327         /* clear OUT bits in ep status */
2328         writel(UDC_EPSTS_OUT_CLEAR, &ep->regs->sts);
2329 finished:
2330         return ret_val;
2331 }
2332
2333 /* Interrupt handler for data IN traffic */
2334 static irqreturn_t udc_data_in_isr(struct udc *dev, int ep_ix)
2335 {
2336         irqreturn_t ret_val = IRQ_NONE;
2337         u32 tmp;
2338         u32 epsts;
2339         struct udc_ep *ep;
2340         struct udc_request *req;
2341         struct udc_data_dma *td;
2342         unsigned dma_done;
2343         unsigned len;
2344
2345         ep = &dev->ep[ep_ix];
2346
2347         epsts = readl(&ep->regs->sts);
2348         if (use_dma) {
2349                 /* BNA ? */
2350                 if (epsts & AMD_BIT(UDC_EPSTS_BNA)) {
2351                         dev_err(&dev->pdev->dev,
2352                                 "BNA ep%din occured - DESPTR = %08lx \n",
2353                                 ep->num,
2354                                 (unsigned long) readl(&ep->regs->desptr));
2355
2356                         /* clear BNA */
2357                         writel(epsts, &ep->regs->sts);
2358                         ret_val = IRQ_HANDLED;
2359                         goto finished;
2360                 }
2361         }
2362         /* HE event ? */
2363         if (epsts & AMD_BIT(UDC_EPSTS_HE)) {
2364                 dev_err(&dev->pdev->dev,
2365                         "HE ep%dn occured - DESPTR = %08lx \n",
2366                         ep->num, (unsigned long) readl(&ep->regs->desptr));
2367
2368                 /* clear HE */
2369                 writel(epsts | AMD_BIT(UDC_EPSTS_HE), &ep->regs->sts);
2370                 ret_val = IRQ_HANDLED;
2371                 goto finished;
2372         }
2373
2374         /* DMA completion */
2375         if (epsts & AMD_BIT(UDC_EPSTS_TDC)) {
2376                 VDBG(dev, "TDC set- completion\n");
2377                 ret_val = IRQ_HANDLED;
2378                 if (!ep->cancel_transfer && !list_empty(&ep->queue)) {
2379                         req = list_entry(ep->queue.next,
2380                                         struct udc_request, queue);
2381                         /*
2382                          * length bytes transfered
2383                          * check dma done of last desc. in PPBDU mode
2384                          */
2385                         if (use_dma_ppb_du) {
2386                                 td = udc_get_last_dma_desc(req);
2387                                 if (td) {
2388                                         dma_done =
2389                                                 AMD_GETBITS(td->status,
2390                                                 UDC_DMA_IN_STS_BS);
2391                                         /* don't care DMA done */
2392                                         req->req.actual = req->req.length;
2393                                 }
2394                         } else {
2395                                 /* assume all bytes transferred */
2396                                 req->req.actual = req->req.length;
2397                         }
2398
2399                         if (req->req.actual == req->req.length) {
2400                                 /* complete req */
2401                                 complete_req(ep, req, 0);
2402                                 req->dma_going = 0;
2403                                 /* further request available ? */
2404                                 if (list_empty(&ep->queue)) {
2405                                         /* disable interrupt */
2406                                         tmp = readl(&dev->regs->ep_irqmsk);
2407                                         tmp |= AMD_BIT(ep->num);
2408                                         writel(tmp, &dev->regs->ep_irqmsk);
2409                                 }
2410                         }
2411                 }
2412                 ep->cancel_transfer = 0;
2413
2414         }
2415         /*
2416          * status reg has IN bit set and TDC not set (if TDC was handled,
2417          * IN must not be handled (UDC defect) ?
2418          */
2419         if ((epsts & AMD_BIT(UDC_EPSTS_IN))
2420                         && !(epsts & AMD_BIT(UDC_EPSTS_TDC))) {
2421                 ret_val = IRQ_HANDLED;
2422                 if (!list_empty(&ep->queue)) {
2423                         /* next request */
2424                         req = list_entry(ep->queue.next,
2425                                         struct udc_request, queue);
2426                         /* FIFO mode */
2427                         if (!use_dma) {
2428                                 /* write fifo */
2429                                 udc_txfifo_write(ep, &req->req);
2430                                 len = req->req.length - req->req.actual;
2431                                                 if (len > ep->ep.maxpacket)
2432                                                         len = ep->ep.maxpacket;
2433                                                 req->req.actual += len;
2434                                 if (req->req.actual == req->req.length
2435                                         || (len != ep->ep.maxpacket)) {
2436                                         /* complete req */
2437                                         complete_req(ep, req, 0);
2438                                 }
2439                         /* DMA */
2440                         } else if (req && !req->dma_going) {
2441                                 VDBG(dev, "IN DMA : req=%p req->td_data=%p\n",
2442                                         req, req->td_data);
2443                                 if (req->td_data) {
2444
2445                                         req->dma_going = 1;
2446
2447                                         /*
2448                                          * unset L bit of first desc.
2449                                          * for chain
2450                                          */
2451                                         if (use_dma_ppb && req->req.length >
2452                                                         ep->ep.maxpacket) {
2453                                                 req->td_data->status &=
2454                                                         AMD_CLEAR_BIT(
2455                                                         UDC_DMA_IN_STS_L);
2456                                         }
2457
2458                                         /* write desc pointer */
2459                                         writel(req->td_phys, &ep->regs->desptr);
2460
2461                                         /* set HOST READY */
2462                                         req->td_data->status =
2463                                                 AMD_ADDBITS(
2464                                                 req->td_data->status,
2465                                                 UDC_DMA_IN_STS_BS_HOST_READY,
2466                                                 UDC_DMA_IN_STS_BS);
2467
2468                                         /* set poll demand bit */
2469                                         tmp = readl(&ep->regs->ctl);
2470                                         tmp |= AMD_BIT(UDC_EPCTL_P);
2471                                         writel(tmp, &ep->regs->ctl);
2472                                 }
2473                         }
2474
2475                 }
2476         }
2477         /* clear status bits */
2478         writel(epsts, &ep->regs->sts);
2479
2480 finished:
2481         return ret_val;
2482
2483 }
2484
2485 /* Interrupt handler for Control OUT traffic */
2486 static irqreturn_t udc_control_out_isr(struct udc *dev)
2487 __releases(dev->lock)
2488 __acquires(dev->lock)
2489 {
2490         irqreturn_t ret_val = IRQ_NONE;
2491         u32 tmp;
2492         int setup_supported;
2493         u32 count;
2494         int set = 0;
2495         struct udc_ep   *ep;
2496         struct udc_ep   *ep_tmp;
2497
2498         ep = &dev->ep[UDC_EP0OUT_IX];
2499
2500         /* clear irq */
2501         writel(AMD_BIT(UDC_EPINT_OUT_EP0), &dev->regs->ep_irqsts);
2502
2503         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->sts);
2504         /* check BNA and clear if set */
2505         if (tmp & AMD_BIT(UDC_EPSTS_BNA)) {
2506                 VDBG(dev, "ep0: BNA set\n");
2507                 writel(AMD_BIT(UDC_EPSTS_BNA),
2508                         &dev->ep[UDC_EP0OUT_IX].regs->sts);
2509                 ep->bna_occurred = 1;
2510                 ret_val = IRQ_HANDLED;
2511                 goto finished;
2512         }
2513
2514         /* type of data: SETUP or DATA 0 bytes */
2515         tmp = AMD_GETBITS(tmp, UDC_EPSTS_OUT);
2516         VDBG(dev, "data_typ = %x\n", tmp);
2517
2518         /* setup data */
2519         if (tmp == UDC_EPSTS_OUT_SETUP) {
2520                 ret_val = IRQ_HANDLED;
2521
2522                 ep->dev->stall_ep0in = 0;
2523                 dev->waiting_zlp_ack_ep0in = 0;
2524
2525                 /* set NAK for EP0_IN */
2526                 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
2527                 tmp |= AMD_BIT(UDC_EPCTL_SNAK);
2528                 writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
2529                 dev->ep[UDC_EP0IN_IX].naking = 1;
2530                 /* get setup data */
2531                 if (use_dma) {
2532
2533                         /* clear OUT bits in ep status */
2534                         writel(UDC_EPSTS_OUT_CLEAR,
2535                                 &dev->ep[UDC_EP0OUT_IX].regs->sts);
2536
2537                         setup_data.data[0] =
2538                                 dev->ep[UDC_EP0OUT_IX].td_stp->data12;
2539                         setup_data.data[1] =
2540                                 dev->ep[UDC_EP0OUT_IX].td_stp->data34;
2541                         /* set HOST READY */
2542                         dev->ep[UDC_EP0OUT_IX].td_stp->status =
2543                                         UDC_DMA_STP_STS_BS_HOST_READY;
2544                 } else {
2545                         /* read fifo */
2546                         udc_rxfifo_read_dwords(dev, setup_data.data, 2);
2547                 }
2548
2549                 /* determine direction of control data */
2550                 if ((setup_data.request.bRequestType & USB_DIR_IN) != 0) {
2551                         dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IX].ep;
2552                         /* enable RDE */
2553                         udc_ep0_set_rde(dev);
2554                         set = 0;
2555                 } else {
2556                         dev->gadget.ep0 = &dev->ep[UDC_EP0OUT_IX].ep;
2557                         /*
2558                          * implant BNA dummy descriptor to allow RXFIFO opening
2559                          * by RDE
2560                          */
2561                         if (ep->bna_dummy_req) {
2562                                 /* write desc pointer */
2563                                 writel(ep->bna_dummy_req->td_phys,
2564                                         &dev->ep[UDC_EP0OUT_IX].regs->desptr);
2565                                 ep->bna_occurred = 0;
2566                         }
2567
2568                         set = 1;
2569                         dev->ep[UDC_EP0OUT_IX].naking = 1;
2570                         /*
2571                          * setup timer for enabling RDE (to not enable
2572                          * RXFIFO DMA for data to early)
2573                          */
2574                         set_rde = 1;
2575                         if (!timer_pending(&udc_timer)) {
2576                                 udc_timer.expires = jiffies +
2577                                                         HZ/UDC_RDE_TIMER_DIV;
2578                                 if (!stop_timer) {
2579                                         add_timer(&udc_timer);
2580                                 }
2581                         }
2582                 }
2583
2584                 /*
2585                  * mass storage reset must be processed here because
2586                  * next packet may be a CLEAR_FEATURE HALT which would not
2587                  * clear the stall bit when no STALL handshake was received
2588                  * before (autostall can cause this)
2589                  */
2590                 if (setup_data.data[0] == UDC_MSCRES_DWORD0
2591                                 && setup_data.data[1] == UDC_MSCRES_DWORD1) {
2592                         DBG(dev, "MSC Reset\n");
2593                         /*
2594                          * clear stall bits
2595                          * only one IN and OUT endpoints are handled
2596                          */
2597                         ep_tmp = &udc->ep[UDC_EPIN_IX];
2598                         udc_set_halt(&ep_tmp->ep, 0);
2599                         ep_tmp = &udc->ep[UDC_EPOUT_IX];
2600                         udc_set_halt(&ep_tmp->ep, 0);
2601                 }
2602
2603                 /* call gadget with setup data received */
2604                 spin_unlock(&dev->lock);
2605                 setup_supported = dev->driver->setup(&dev->gadget,
2606                                                 &setup_data.request);
2607                 spin_lock(&dev->lock);
2608
2609                 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
2610                 /* ep0 in returns data (not zlp) on IN phase */
2611                 if (setup_supported >= 0 && setup_supported <
2612                                 UDC_EP0IN_MAXPACKET) {
2613                         /* clear NAK by writing CNAK in EP0_IN */
2614                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
2615                         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
2616                         dev->ep[UDC_EP0IN_IX].naking = 0;
2617                         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX], UDC_EP0IN_IX);
2618
2619                 /* if unsupported request then stall */
2620                 } else if (setup_supported < 0) {
2621                         tmp |= AMD_BIT(UDC_EPCTL_S);
2622                         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
2623                 } else
2624                         dev->waiting_zlp_ack_ep0in = 1;
2625
2626
2627                 /* clear NAK by writing CNAK in EP0_OUT */
2628                 if (!set) {
2629                         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
2630                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
2631                         writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
2632                         dev->ep[UDC_EP0OUT_IX].naking = 0;
2633                         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX], UDC_EP0OUT_IX);
2634                 }
2635
2636                 if (!use_dma) {
2637                         /* clear OUT bits in ep status */
2638                         writel(UDC_EPSTS_OUT_CLEAR,
2639                                 &dev->ep[UDC_EP0OUT_IX].regs->sts);
2640                 }
2641
2642         /* data packet 0 bytes */
2643         } else if (tmp == UDC_EPSTS_OUT_DATA) {
2644                 /* clear OUT bits in ep status */
2645                 writel(UDC_EPSTS_OUT_CLEAR, &dev->ep[UDC_EP0OUT_IX].regs->sts);
2646
2647                 /* get setup data: only 0 packet */
2648                 if (use_dma) {
2649                         /* no req if 0 packet, just reactivate */
2650                         if (list_empty(&dev->ep[UDC_EP0OUT_IX].queue)) {
2651                                 VDBG(dev, "ZLP\n");
2652
2653                                 /* set HOST READY */
2654                                 dev->ep[UDC_EP0OUT_IX].td->status =
2655                                         AMD_ADDBITS(
2656                                         dev->ep[UDC_EP0OUT_IX].td->status,
2657                                         UDC_DMA_OUT_STS_BS_HOST_READY,
2658                                         UDC_DMA_OUT_STS_BS);
2659                                 /* enable RDE */
2660                                 udc_ep0_set_rde(dev);
2661                                 ret_val = IRQ_HANDLED;
2662
2663                         } else {
2664                                 /* control write */
2665                                 ret_val |= udc_data_out_isr(dev, UDC_EP0OUT_IX);
2666                                 /* re-program desc. pointer for possible ZLPs */
2667                                 writel(dev->ep[UDC_EP0OUT_IX].td_phys,
2668                                         &dev->ep[UDC_EP0OUT_IX].regs->desptr);
2669                                 /* enable RDE */
2670                                 udc_ep0_set_rde(dev);
2671                         }
2672                 } else {
2673
2674                         /* received number bytes */
2675                         count = readl(&dev->ep[UDC_EP0OUT_IX].regs->sts);
2676                         count = AMD_GETBITS(count, UDC_EPSTS_RX_PKT_SIZE);
2677                         /* out data for fifo mode not working */
2678                         count = 0;
2679
2680                         /* 0 packet or real data ? */
2681                         if (count != 0) {
2682                                 ret_val |= udc_data_out_isr(dev, UDC_EP0OUT_IX);
2683                         } else {
2684                                 /* dummy read confirm */
2685                                 readl(&dev->ep[UDC_EP0OUT_IX].regs->confirm);
2686                                 ret_val = IRQ_HANDLED;
2687                         }
2688                 }
2689         }
2690
2691         /* check pending CNAKS */
2692         if (cnak_pending) {
2693                 /* CNAk processing when rxfifo empty only */
2694                 if (readl(&dev->regs->sts) & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) {
2695                         udc_process_cnak_queue(dev);
2696                 }
2697         }
2698
2699 finished:
2700         return ret_val;
2701 }
2702
2703 /* Interrupt handler for Control IN traffic */
2704 static irqreturn_t udc_control_in_isr(struct udc *dev)
2705 {
2706         irqreturn_t ret_val = IRQ_NONE;
2707         u32 tmp;
2708         struct udc_ep *ep;
2709         struct udc_request *req;
2710         unsigned len;
2711
2712         ep = &dev->ep[UDC_EP0IN_IX];
2713
2714         /* clear irq */
2715         writel(AMD_BIT(UDC_EPINT_IN_EP0), &dev->regs->ep_irqsts);
2716
2717         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->sts);
2718         /* DMA completion */
2719         if (tmp & AMD_BIT(UDC_EPSTS_TDC)) {
2720                 VDBG(dev, "isr: TDC clear \n");
2721                 ret_val = IRQ_HANDLED;
2722
2723                 /* clear TDC bit */
2724                 writel(AMD_BIT(UDC_EPSTS_TDC),
2725                                 &dev->ep[UDC_EP0IN_IX].regs->sts);
2726
2727         /* status reg has IN bit set ? */
2728         } else if (tmp & AMD_BIT(UDC_EPSTS_IN)) {
2729                 ret_val = IRQ_HANDLED;
2730
2731                 if (ep->dma) {
2732                         /* clear IN bit */
2733                         writel(AMD_BIT(UDC_EPSTS_IN),
2734                                 &dev->ep[UDC_EP0IN_IX].regs->sts);
2735                 }
2736                 if (dev->stall_ep0in) {
2737                         DBG(dev, "stall ep0in\n");
2738                         /* halt ep0in */
2739                         tmp = readl(&ep->regs->ctl);
2740                         tmp |= AMD_BIT(UDC_EPCTL_S);
2741                         writel(tmp, &ep->regs->ctl);
2742                 } else {
2743                         if (!list_empty(&ep->queue)) {
2744                                 /* next request */
2745                                 req = list_entry(ep->queue.next,
2746                                                 struct udc_request, queue);
2747
2748                                 if (ep->dma) {
2749                                         /* write desc pointer */
2750                                         writel(req->td_phys, &ep->regs->desptr);
2751                                         /* set HOST READY */
2752                                         req->td_data->status =
2753                                                 AMD_ADDBITS(
2754                                                 req->td_data->status,
2755                                                 UDC_DMA_STP_STS_BS_HOST_READY,
2756                                                 UDC_DMA_STP_STS_BS);
2757
2758                                         /* set poll demand bit */
2759                                         tmp =
2760                                         readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
2761                                         tmp |= AMD_BIT(UDC_EPCTL_P);
2762                                         writel(tmp,
2763                                         &dev->ep[UDC_EP0IN_IX].regs->ctl);
2764
2765                                         /* all bytes will be transferred */
2766                                         req->req.actual = req->req.length;
2767
2768                                         /* complete req */
2769                                         complete_req(ep, req, 0);
2770
2771                                 } else {
2772                                         /* write fifo */
2773                                         udc_txfifo_write(ep, &req->req);
2774
2775                                         /* lengh bytes transfered */
2776                                         len = req->req.length - req->req.actual;
2777                                         if (len > ep->ep.maxpacket)
2778                                                 len = ep->ep.maxpacket;
2779
2780                                         req->req.actual += len;
2781                                         if (req->req.actual == req->req.length
2782                                                 || (len != ep->ep.maxpacket)) {
2783                                                 /* complete req */
2784                                                 complete_req(ep, req, 0);
2785                                         }
2786                                 }
2787
2788                         }
2789                 }
2790                 ep->halted = 0;
2791                 dev->stall_ep0in = 0;
2792                 if (!ep->dma) {
2793                         /* clear IN bit */
2794                         writel(AMD_BIT(UDC_EPSTS_IN),
2795                                 &dev->ep[UDC_EP0IN_IX].regs->sts);
2796                 }
2797         }
2798
2799         return ret_val;
2800 }
2801
2802
2803 /* Interrupt handler for global device events */
2804 static irqreturn_t udc_dev_isr(struct udc *dev, u32 dev_irq)
2805 __releases(dev->lock)
2806 __acquires(dev->lock)
2807 {
2808         irqreturn_t ret_val = IRQ_NONE;
2809         u32 tmp;
2810         u32 cfg;
2811         struct udc_ep *ep;
2812         u16 i;
2813         u8 udc_csr_epix;
2814
2815         /* SET_CONFIG irq ? */
2816         if (dev_irq & AMD_BIT(UDC_DEVINT_SC)) {
2817                 ret_val = IRQ_HANDLED;
2818
2819                 /* read config value */
2820                 tmp = readl(&dev->regs->sts);
2821                 cfg = AMD_GETBITS(tmp, UDC_DEVSTS_CFG);
2822                 DBG(dev, "SET_CONFIG interrupt: config=%d\n", cfg);
2823                 dev->cur_config = cfg;
2824                 dev->set_cfg_not_acked = 1;
2825
2826                 /* make usb request for gadget driver */
2827                 memset(&setup_data, 0 , sizeof(union udc_setup_data));
2828                 setup_data.request.bRequest = USB_REQ_SET_CONFIGURATION;
2829                 setup_data.request.wValue = cpu_to_le16(dev->cur_config);
2830
2831                 /* programm the NE registers */
2832                 for (i = 0; i < UDC_EP_NUM; i++) {
2833                         ep = &dev->ep[i];
2834                         if (ep->in) {
2835
2836                                 /* ep ix in UDC CSR register space */
2837                                 udc_csr_epix = ep->num;
2838
2839
2840                         /* OUT ep */
2841                         } else {
2842                                 /* ep ix in UDC CSR register space */
2843                                 udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
2844                         }
2845
2846                         tmp = readl(&dev->csr->ne[udc_csr_epix]);
2847                         /* ep cfg */
2848                         tmp = AMD_ADDBITS(tmp, ep->dev->cur_config,
2849                                                 UDC_CSR_NE_CFG);
2850                         /* write reg */
2851                         writel(tmp, &dev->csr->ne[udc_csr_epix]);
2852
2853                         /* clear stall bits */
2854                         ep->halted = 0;
2855                         tmp = readl(&ep->regs->ctl);
2856                         tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
2857                         writel(tmp, &ep->regs->ctl);
2858                 }
2859                 /* call gadget zero with setup data received */
2860                 spin_unlock(&dev->lock);
2861                 tmp = dev->driver->setup(&dev->gadget, &setup_data.request);
2862                 spin_lock(&dev->lock);
2863
2864         } /* SET_INTERFACE ? */
2865         if (dev_irq & AMD_BIT(UDC_DEVINT_SI)) {
2866                 ret_val = IRQ_HANDLED;
2867
2868                 dev->set_cfg_not_acked = 1;
2869                 /* read interface and alt setting values */
2870                 tmp = readl(&dev->regs->sts);
2871                 dev->cur_alt = AMD_GETBITS(tmp, UDC_DEVSTS_ALT);
2872                 dev->cur_intf = AMD_GETBITS(tmp, UDC_DEVSTS_INTF);
2873
2874                 /* make usb request for gadget driver */
2875                 memset(&setup_data, 0 , sizeof(union udc_setup_data));
2876                 setup_data.request.bRequest = USB_REQ_SET_INTERFACE;
2877                 setup_data.request.bRequestType = USB_RECIP_INTERFACE;
2878                 setup_data.request.wValue = cpu_to_le16(dev->cur_alt);
2879                 setup_data.request.wIndex = cpu_to_le16(dev->cur_intf);
2880
2881                 DBG(dev, "SET_INTERFACE interrupt: alt=%d intf=%d\n",
2882                                 dev->cur_alt, dev->cur_intf);
2883
2884                 /* programm the NE registers */
2885                 for (i = 0; i < UDC_EP_NUM; i++) {
2886                         ep = &dev->ep[i];
2887                         if (ep->in) {
2888
2889                                 /* ep ix in UDC CSR register space */
2890                                 udc_csr_epix = ep->num;
2891
2892
2893                         /* OUT ep */
2894                         } else {
2895                                 /* ep ix in UDC CSR register space */
2896                                 udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
2897                         }
2898
2899                         /* UDC CSR reg */
2900                         /* set ep values */
2901                         tmp = readl(&dev->csr->ne[udc_csr_epix]);
2902                         /* ep interface */
2903                         tmp = AMD_ADDBITS(tmp, ep->dev->cur_intf,
2904                                                 UDC_CSR_NE_INTF);
2905                         /* tmp = AMD_ADDBITS(tmp, 2, UDC_CSR_NE_INTF); */
2906                         /* ep alt */
2907                         tmp = AMD_ADDBITS(tmp, ep->dev->cur_alt,
2908                                                 UDC_CSR_NE_ALT);
2909                         /* write reg */
2910                         writel(tmp, &dev->csr->ne[udc_csr_epix]);
2911
2912                         /* clear stall bits */
2913                         ep->halted = 0;
2914                         tmp = readl(&ep->regs->ctl);
2915                         tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
2916                         writel(tmp, &ep->regs->ctl);
2917                 }
2918
2919                 /* call gadget zero with setup data received */
2920                 spin_unlock(&dev->lock);
2921                 tmp = dev->driver->setup(&dev->gadget, &setup_data.request);
2922                 spin_lock(&dev->lock);
2923
2924         } /* USB reset */
2925         if (dev_irq & AMD_BIT(UDC_DEVINT_UR)) {
2926                 DBG(dev, "USB Reset interrupt\n");
2927                 ret_val = IRQ_HANDLED;
2928
2929                 /* allow soft reset when suspend occurs */
2930                 soft_reset_occured = 0;
2931
2932                 dev->waiting_zlp_ack_ep0in = 0;
2933                 dev->set_cfg_not_acked = 0;
2934
2935                 /* mask not needed interrupts */
2936                 udc_mask_unused_interrupts(dev);
2937
2938                 /* call gadget to resume and reset configs etc. */
2939                 spin_unlock(&dev->lock);
2940                 if (dev->sys_suspended && dev->driver->resume) {
2941                         dev->driver->resume(&dev->gadget);
2942                         dev->sys_suspended = 0;
2943                 }
2944                 dev->driver->disconnect(&dev->gadget);
2945                 spin_lock(&dev->lock);
2946
2947                 /* disable ep0 to empty req queue */
2948                 empty_req_queue(&dev->ep[UDC_EP0IN_IX]);
2949                 ep_init(dev->regs, &dev->ep[UDC_EP0IN_IX]);
2950
2951                 /* soft reset when rxfifo not empty */
2952                 tmp = readl(&dev->regs->sts);
2953                 if (!(tmp & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY))
2954                                 && !soft_reset_after_usbreset_occured) {
2955                         udc_soft_reset(dev);
2956                         soft_reset_after_usbreset_occured++;
2957                 }
2958
2959                 /*
2960                  * DMA reset to kill potential old DMA hw hang,
2961                  * POLL bit is already reset by ep_init() through
2962                  * disconnect()
2963                  */
2964                 DBG(dev, "DMA machine reset\n");
2965                 tmp = readl(&dev->regs->cfg);
2966                 writel(tmp | AMD_BIT(UDC_DEVCFG_DMARST), &dev->regs->cfg);
2967                 writel(tmp, &dev->regs->cfg);
2968
2969                 /* put into initial config */
2970                 udc_basic_init(dev);
2971
2972                 /* enable device setup interrupts */
2973                 udc_enable_dev_setup_interrupts(dev);
2974
2975                 /* enable suspend interrupt */
2976                 tmp = readl(&dev->regs->irqmsk);
2977                 tmp &= AMD_UNMASK_BIT(UDC_DEVINT_US);
2978                 writel(tmp, &dev->regs->irqmsk);
2979
2980         } /* USB suspend */
2981         if (dev_irq & AMD_BIT(UDC_DEVINT_US)) {
2982                 DBG(dev, "USB Suspend interrupt\n");
2983                 ret_val = IRQ_HANDLED;
2984                 if (dev->driver->suspend) {
2985                         spin_unlock(&dev->lock);
2986                         dev->sys_suspended = 1;
2987                         dev->driver->suspend(&dev->gadget);
2988                         spin_lock(&dev->lock);
2989                 }
2990         } /* new speed ? */
2991         if (dev_irq & AMD_BIT(UDC_DEVINT_ENUM)) {
2992                 DBG(dev, "ENUM interrupt\n");
2993                 ret_val = IRQ_HANDLED;
2994                 soft_reset_after_usbreset_occured = 0;
2995
2996                 /* disable ep0 to empty req queue */
2997                 empty_req_queue(&dev->ep[UDC_EP0IN_IX]);
2998                 ep_init(dev->regs, &dev->ep[UDC_EP0IN_IX]);
2999
3000                 /* link up all endpoints */
3001                 udc_setup_endpoints(dev);
3002                 if (dev->gadget.speed == USB_SPEED_HIGH) {
3003                         dev_info(&dev->pdev->dev, "Connect: speed = %s\n",
3004                                 "high");
3005                 } else if (dev->gadget.speed == USB_SPEED_FULL) {
3006                         dev_info(&dev->pdev->dev, "Connect: speed = %s\n",
3007                                 "full");
3008                 }
3009
3010                 /* init ep 0 */
3011                 activate_control_endpoints(dev);
3012
3013                 /* enable ep0 interrupts */
3014                 udc_enable_ep0_interrupts(dev);
3015         }
3016         /* session valid change interrupt */
3017         if (dev_irq & AMD_BIT(UDC_DEVINT_SVC)) {
3018                 DBG(dev, "USB SVC interrupt\n");
3019                 ret_val = IRQ_HANDLED;
3020
3021                 /* check that session is not valid to detect disconnect */
3022                 tmp = readl(&dev->regs->sts);
3023                 if (!(tmp & AMD_BIT(UDC_DEVSTS_SESSVLD))) {
3024                         /* disable suspend interrupt */
3025                         tmp = readl(&dev->regs->irqmsk);
3026                         tmp |= AMD_BIT(UDC_DEVINT_US);
3027                         writel(tmp, &dev->regs->irqmsk);
3028                         DBG(dev, "USB Disconnect (session valid low)\n");
3029                         /* cleanup on disconnect */
3030                         usb_disconnect(udc);
3031                 }
3032
3033         }
3034
3035         return ret_val;
3036 }
3037
3038 /* Interrupt Service Routine, see Linux Kernel Doc for parameters */
3039 static irqreturn_t udc_irq(int irq, void *pdev)
3040 {
3041         struct udc *dev = pdev;
3042         u32 reg;
3043         u16 i;
3044         u32 ep_irq;
3045         irqreturn_t ret_val = IRQ_NONE;
3046
3047         spin_lock(&dev->lock);
3048
3049         /* check for ep irq */
3050         reg = readl(&dev->regs->ep_irqsts);
3051         if (reg) {
3052                 if (reg & AMD_BIT(UDC_EPINT_OUT_EP0))
3053                         ret_val |= udc_control_out_isr(dev);
3054                 if (reg & AMD_BIT(UDC_EPINT_IN_EP0))
3055                         ret_val |= udc_control_in_isr(dev);
3056
3057                 /*
3058                  * data endpoint
3059                  * iterate ep's
3060                  */
3061                 for (i = 1; i < UDC_EP_NUM; i++) {
3062                         ep_irq = 1 << i;
3063                         if (!(reg & ep_irq) || i == UDC_EPINT_OUT_EP0)
3064                                 continue;
3065
3066                         /* clear irq status */
3067                         writel(ep_irq, &dev->regs->ep_irqsts);
3068
3069                         /* irq for out ep ? */
3070                         if (i > UDC_EPIN_NUM)
3071                                 ret_val |= udc_data_out_isr(dev, i);
3072                         else
3073                                 ret_val |= udc_data_in_isr(dev, i);
3074                 }
3075
3076         }
3077
3078
3079         /* check for dev irq */
3080         reg = readl(&dev->regs->irqsts);
3081         if (reg) {
3082                 /* clear irq */
3083                 writel(reg, &dev->regs->irqsts);
3084                 ret_val |= udc_dev_isr(dev, reg);
3085         }
3086
3087
3088         spin_unlock(&dev->lock);
3089         return ret_val;
3090 }
3091
3092 /* Tears down device */
3093 static void gadget_release(struct device *pdev)
3094 {
3095         struct amd5536udc *dev = dev_get_drvdata(pdev);
3096         kfree(dev);
3097 }
3098
3099 /* Cleanup on device remove */
3100 static void udc_remove(struct udc *dev)
3101 {
3102         /* remove timer */
3103         stop_timer++;
3104         if (timer_pending(&udc_timer))
3105                 wait_for_completion(&on_exit);
3106         if (udc_timer.data)
3107                 del_timer_sync(&udc_timer);
3108         /* remove pollstall timer */
3109         stop_pollstall_timer++;
3110         if (timer_pending(&udc_pollstall_timer))
3111                 wait_for_completion(&on_pollstall_exit);
3112         if (udc_pollstall_timer.data)
3113                 del_timer_sync(&udc_pollstall_timer);
3114         udc = NULL;
3115 }
3116
3117 /* Reset all pci context */
3118 static void udc_pci_remove(struct pci_dev *pdev)
3119 {
3120         struct udc              *dev;
3121
3122         dev = pci_get_drvdata(pdev);
3123
3124         /* gadget driver must not be registered */
3125         BUG_ON(dev->driver != NULL);
3126
3127         /* dma pool cleanup */
3128         if (dev->data_requests)
3129                 pci_pool_destroy(dev->data_requests);
3130
3131         if (dev->stp_requests) {
3132                 /* cleanup DMA desc's for ep0in */
3133                 pci_pool_free(dev->stp_requests,
3134                         dev->ep[UDC_EP0OUT_IX].td_stp,
3135                         dev->ep[UDC_EP0OUT_IX].td_stp_dma);
3136                 pci_pool_free(dev->stp_requests,
3137                         dev->ep[UDC_EP0OUT_IX].td,
3138                         dev->ep[UDC_EP0OUT_IX].td_phys);
3139
3140                 pci_pool_destroy(dev->stp_requests);
3141         }
3142
3143         /* reset controller */
3144         writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg);
3145         if (dev->irq_registered)
3146                 free_irq(pdev->irq, dev);
3147         if (dev->regs)
3148                 iounmap(dev->regs);
3149         if (dev->mem_region)
3150                 release_mem_region(pci_resource_start(pdev, 0),
3151                                 pci_resource_len(pdev, 0));
3152         if (dev->active)
3153                 pci_disable_device(pdev);
3154
3155         device_unregister(&dev->gadget.dev);
3156         pci_set_drvdata(pdev, NULL);
3157
3158         udc_remove(dev);
3159 }
3160
3161 /* create dma pools on init */
3162 static int init_dma_pools(struct udc *dev)
3163 {
3164         struct udc_stp_dma      *td_stp;
3165         struct udc_data_dma     *td_data;
3166         int retval;
3167
3168         /* consistent DMA mode setting ? */
3169         if (use_dma_ppb) {
3170                 use_dma_bufferfill_mode = 0;
3171         } else {
3172                 use_dma_ppb_du = 0;
3173                 use_dma_bufferfill_mode = 1;
3174         }
3175
3176         /* DMA setup */
3177         dev->data_requests = dma_pool_create("data_requests", NULL,
3178                 sizeof(struct udc_data_dma), 0, 0);
3179         if (!dev->data_requests) {
3180                 DBG(dev, "can't get request data pool\n");
3181                 retval = -ENOMEM;
3182                 goto finished;
3183         }
3184
3185         /* EP0 in dma regs = dev control regs */
3186         dev->ep[UDC_EP0IN_IX].dma = &dev->regs->ctl;
3187
3188         /* dma desc for setup data */
3189         dev->stp_requests = dma_pool_create("setup requests", NULL,
3190                 sizeof(struct udc_stp_dma), 0, 0);
3191         if (!dev->stp_requests) {
3192                 DBG(dev, "can't get stp request pool\n");
3193                 retval = -ENOMEM;
3194                 goto finished;
3195         }
3196         /* setup */
3197         td_stp = dma_pool_alloc(dev->stp_requests, GFP_KERNEL,
3198                                 &dev->ep[UDC_EP0OUT_IX].td_stp_dma);
3199         if (td_stp == NULL) {
3200                 retval = -ENOMEM;
3201                 goto finished;
3202         }
3203         dev->ep[UDC_EP0OUT_IX].td_stp = td_stp;
3204
3205         /* data: 0 packets !? */
3206         td_data = dma_pool_alloc(dev->stp_requests, GFP_KERNEL,
3207                                 &dev->ep[UDC_EP0OUT_IX].td_phys);
3208         if (td_data == NULL) {
3209                 retval = -ENOMEM;
3210                 goto finished;
3211         }
3212         dev->ep[UDC_EP0OUT_IX].td = td_data;
3213         return 0;
3214
3215 finished:
3216         return retval;
3217 }
3218
3219 /* Called by pci bus driver to init pci context */
3220 static int udc_pci_probe(
3221         struct pci_dev *pdev,
3222         const struct pci_device_id *id
3223 )
3224 {
3225         struct udc              *dev;
3226         unsigned long           resource;
3227         unsigned long           len;
3228         int                     retval = 0;
3229
3230         /* one udc only */
3231         if (udc) {
3232                 dev_dbg(&pdev->dev, "already probed\n");
3233                 return -EBUSY;
3234         }
3235
3236         /* init */
3237         dev = kzalloc(sizeof(struct udc), GFP_KERNEL);
3238         if (!dev) {
3239                 retval = -ENOMEM;
3240                 goto finished;
3241         }
3242
3243         /* pci setup */
3244         if (pci_enable_device(pdev) < 0) {
3245                 kfree(dev);
3246                 dev = NULL;
3247                 retval = -ENODEV;
3248                 goto finished;
3249         }
3250         dev->active = 1;
3251
3252         /* PCI resource allocation */
3253         resource = pci_resource_start(pdev, 0);
3254         len = pci_resource_len(pdev, 0);
3255
3256         if (!request_mem_region(resource, len, name)) {
3257                 dev_dbg(&pdev->dev, "pci device used already\n");
3258                 kfree(dev);
3259                 dev = NULL;
3260                 retval = -EBUSY;
3261                 goto finished;
3262         }
3263         dev->mem_region = 1;
3264
3265         dev->virt_addr = ioremap_nocache(resource, len);
3266         if (dev->virt_addr == NULL) {
3267                 dev_dbg(&pdev->dev, "start address cannot be mapped\n");
3268                 kfree(dev);
3269                 dev = NULL;
3270                 retval = -EFAULT;
3271                 goto finished;
3272         }
3273
3274         if (!pdev->irq) {
3275                 dev_err(&dev->pdev->dev, "irq not set\n");
3276                 kfree(dev);
3277                 dev = NULL;
3278                 retval = -ENODEV;
3279                 goto finished;
3280         }
3281
3282         if (request_irq(pdev->irq, udc_irq, IRQF_SHARED, name, dev) != 0) {
3283                 dev_dbg(&dev->pdev->dev, "request_irq(%d) fail\n", pdev->irq);
3284                 kfree(dev);
3285                 dev = NULL;
3286                 retval = -EBUSY;
3287                 goto finished;
3288         }
3289         dev->irq_registered = 1;
3290
3291         pci_set_drvdata(pdev, dev);
3292
3293         /* chip revision for Hs AMD5536 */
3294         dev->chiprev = pdev->revision;
3295
3296         pci_set_master(pdev);
3297         pci_try_set_mwi(pdev);
3298
3299         /* init dma pools */
3300         if (use_dma) {
3301                 retval = init_dma_pools(dev);
3302                 if (retval != 0)
3303                         goto finished;
3304         }
3305
3306         dev->phys_addr = resource;
3307         dev->irq = pdev->irq;
3308         dev->pdev = pdev;
3309         dev->gadget.dev.parent = &pdev->dev;
3310         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
3311
3312         /* general probing */
3313         if (udc_probe(dev) == 0)
3314                 return 0;
3315
3316 finished:
3317         if (dev)
3318                 udc_pci_remove(pdev);
3319         return retval;
3320 }
3321
3322 /* general probe */
3323 static int udc_probe(struct udc *dev)
3324 {
3325         char            tmp[128];
3326         u32             reg;
3327         int             retval;
3328
3329         /* mark timer as not initialized */
3330         udc_timer.data = 0;
3331         udc_pollstall_timer.data = 0;
3332
3333         /* device struct setup */
3334         spin_lock_init(&dev->lock);
3335         dev->gadget.ops = &udc_ops;
3336
3337         dev_set_name(&dev->gadget.dev, "gadget");
3338         dev->gadget.dev.release = gadget_release;
3339         dev->gadget.name = name;
3340         dev->gadget.name = name;
3341         dev->gadget.is_dualspeed = 1;
3342
3343         /* udc csr registers base */
3344         dev->csr = dev->virt_addr + UDC_CSR_ADDR;
3345         /* dev registers base */
3346         dev->regs = dev->virt_addr + UDC_DEVCFG_ADDR;
3347         /* ep registers base */
3348         dev->ep_regs = dev->virt_addr + UDC_EPREGS_ADDR;
3349         /* fifo's base */
3350         dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR);
3351         dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR);
3352
3353         /* init registers, interrupts, ... */
3354         startup_registers(dev);
3355
3356         dev_info(&dev->pdev->dev, "%s\n", mod_desc);
3357
3358         snprintf(tmp, sizeof tmp, "%d", dev->irq);
3359         dev_info(&dev->pdev->dev,
3360                 "irq %s, pci mem %08lx, chip rev %02x(Geode5536 %s)\n",
3361                 tmp, dev->phys_addr, dev->chiprev,
3362                 (dev->chiprev == UDC_HSA0_REV) ? "A0" : "B1");
3363         strcpy(tmp, UDC_DRIVER_VERSION_STRING);
3364         if (dev->chiprev == UDC_HSA0_REV) {
3365                 dev_err(&dev->pdev->dev, "chip revision is A0; too old\n");
3366                 retval = -ENODEV;
3367                 goto finished;
3368         }
3369         dev_info(&dev->pdev->dev,
3370                 "driver version: %s(for Geode5536 B1)\n", tmp);
3371         udc = dev;
3372
3373         retval = device_register(&dev->gadget.dev);
3374         if (retval)
3375                 goto finished;
3376
3377         /* timer init */
3378         init_timer(&udc_timer);
3379         udc_timer.function = udc_timer_function;
3380         udc_timer.data = 1;
3381         /* timer pollstall init */
3382         init_timer(&udc_pollstall_timer);
3383         udc_pollstall_timer.function = udc_pollstall_timer_function;
3384         udc_pollstall_timer.data = 1;
3385
3386         /* set SD */
3387         reg = readl(&dev->regs->ctl);
3388         reg |= AMD_BIT(UDC_DEVCTL_SD);
3389         writel(reg, &dev->regs->ctl);
3390
3391         /* print dev register info */
3392         print_regs(dev);
3393
3394         return 0;
3395
3396 finished:
3397         return retval;
3398 }
3399
3400 /* Initiates a remote wakeup */
3401 static int udc_remote_wakeup(struct udc *dev)
3402 {
3403         unsigned long flags;
3404         u32 tmp;
3405
3406         DBG(dev, "UDC initiates remote wakeup\n");
3407
3408         spin_lock_irqsave(&dev->lock, flags);
3409
3410         tmp = readl(&dev->regs->ctl);
3411         tmp |= AMD_BIT(UDC_DEVCTL_RES);
3412         writel(tmp, &dev->regs->ctl);
3413         tmp &= AMD_CLEAR_BIT(UDC_DEVCTL_RES);
3414         writel(tmp, &dev->regs->ctl);
3415
3416         spin_unlock_irqrestore(&dev->lock, flags);
3417         return 0;
3418 }
3419
3420 /* PCI device parameters */
3421 static const struct pci_device_id pci_id[] = {
3422         {
3423                 PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x2096),
3424                 .class =        (PCI_CLASS_SERIAL_USB << 8) | 0xfe,
3425                 .class_mask =   0xffffffff,
3426         },
3427         {},
3428 };
3429 MODULE_DEVICE_TABLE(pci, pci_id);
3430
3431 /* PCI functions */
3432 static struct pci_driver udc_pci_driver = {
3433         .name =         (char *) name,
3434         .id_table =     pci_id,
3435         .probe =        udc_pci_probe,
3436         .remove =       udc_pci_remove,
3437 };
3438
3439 /* Inits driver */
3440 static int __init init(void)
3441 {
3442         return pci_register_driver(&udc_pci_driver);
3443 }
3444 module_init(init);
3445
3446 /* Cleans driver */
3447 static void __exit cleanup(void)
3448 {
3449         pci_unregister_driver(&udc_pci_driver);
3450 }
3451 module_exit(cleanup);
3452
3453 MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
3454 MODULE_AUTHOR("Thomas Dahlmann");
3455 MODULE_LICENSE("GPL");
3456